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Basic Ruby on Rails MCQ

1. Which code sample will skip running the login_required "before" filter on the get_posts controller action?

Before_action :login_required, skip: [:get_posts]

Skip_before_action :login_required, except: [:get_posts]

Skip_before_action :login_required, only: [:get_posts]

Skip_action before: :login_required, only: [:get_posts]

Answer

Correct Answer: Skip_before_action :login_required, only: [:get_posts]

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2. Which choice is an incorrect way to render a partial?

<%= render(:partial => 'shared/product') %>

<%= render('shared/product', :collection => @products) %>

<%= render(template: 'shared/product', with: @products) %>

<%= render('shared/product', locals: { product: @product }) %>

Answer

Correct Answer: <%= render(template: 'shared/product', with: @products) %>

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3. Given a table of blog_posts and a related table of comments (comments made on each blog post), which ActiveRecord query will retrieve all blog posts with comments created during @range?

BlogPost.joins (:comments).where(comments: {created_at: @range})

BlogPost.where(['comments.created_at', @range])

BlogPost.preload (

BlogPost.includes (:comments).where('comments.created_at' => @range)

Answer

Correct Answer: BlogPost.joins (:comments).where(comments: {created_at: @range})

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4. Which choice is not a valid Rails route?

Route

Match

Root

Get

Answer

Correct Answer: Route

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5. If User is an ActiveRecord class, which choice would be expected to return an array?

User.where(last_name: 'Smith')

User.find_or_create(last_name: 'Smith')

User.find_by_last_name('Smith')

User.find('Smith')

Answer

Correct Answer: User.where(last_name: 'Smith')

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6. Which part of the Rails framework is primarily responsible for making decisions about how to respond to a browser request?

View

Controller

ActiveRecord

Model

Answer

Correct Answer: Controller

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7. Which choice best describes the expected value of @result? @result = Article.first.tags.build(name: 'Urgent')

Either true or false

An unsaved Tag instance

A saved Tag instance

An array of Tag instances

Answer

Correct Answer: An unsaved Tag instance

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8. Which statement about ActiveRecord models is true?

Each database column requres adding a matching attr_accessor declaration in the ActiveRecord model.

All attributes in an ActiveRecord model are read-only declared as writable using attr_accessible

An instance of an ActiveRecord model will have attributes that match the columns in a corresponding database table.

ActiveRecord models can have only attributes that have a matching database column

Answer

Correct Answer: An instance of an ActiveRecord model will have attributes that match the columns in a corresponding database table.

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9. Review the code below. Which Ruby operator should be used to fill in the blank so that the sort method executes properly? [5,8,2,6,1,3].sort {|v1,v2| v1 ___ v2}

<==>

<=>

Answer

Correct Answer: <=>

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10. In a Rails controller, what does the code params.permit(:name, :sku) do?

It filters out all parameters.

It filters out submitted form parameters that are not named :name or :sku to make forms more secure.

It raises an error if parameters that are not named :name or :sku are found.

It raises an error if the :name and :sku parameters are set to nil.

Answer

Correct Answer: It filters out submitted form parameters that are not named :name or :sku to make forms more secure.

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11. Which Rails helper would you use in the application view to protect against CSRF (Cross-Site Request Forgery) attacks?

Csrf_protection

Csrf_helper

Csrf_meta_tags

Csrf

Answer

Correct Answer: Csrf_meta_tags

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12. When Ruby methods add an exclamation point at the end of their name (such as sort!), what does it typically indicate?

The method executes using

Any ending line return will be omitted from the result.

The method will ignore exceptions that occur during execution.

It is a more powerful or destructive version of the method.

Answer

Correct Answer: It is a more powerful or destructive version of the method.

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13. What is a popular alternative template language for generating views in a Rails app that is focused on simple abstracted markup?

Mustache

Haml

Liquid

Tilt

Answer

Correct Answer: Haml

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14. If a model class is named Product, in which database table will ActiveRecord store and retrieve model instances?

Product_table

All_products

Products_table

Products

Answer

Correct Answer: Products

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15. What is the correct way to generate a ProductsController with an index action using only the command-line tools bundled with Rails?

Rails generate controller --options {name:

Rails generate controller --name Products --action index

Rails generate controller Products index

Rails generate ProductsController --actions index

Answer

Correct Answer: Rails generate controller Products index

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16. In Rails, what caching stores can be used?

MemCacheStore, MongoDBStore, MemoryStore, and FileStore

MemoryStore, FileStore, and CacheCacheStore

MemoryStore, FileStore, MemCacheStore, RedisCacheStore, and NullStore

MemoryStore, FileStore, MySQLStore, and RedisCacheStore

Answer

Correct Answer: MemoryStore, FileStore, MemCacheStore, RedisCacheStore, and NullStore

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17. If the Rails asset pipeline is being used to serve JavaScript files, how would you include a link to one of those JavaScript files in a view?

<%= javascript_include_tag 'main' %>

<%= javascript_tag 'main' %>

Answer

Correct Answer: <%= javascript_include_tag 'main' %>

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18. Where should you put images, JavaScript, and CSS so that they get processed by the asset pipeline?

App/static

App/images

App/assets

App/views

Answer

Correct Answer: App/assets

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19. How would you render a view using a different layout in an ERB HTML view?

<% render 'view_mobile' %>

<% render 'view', use_layout: 'mobile' %>

<% render 'view', layout: 'mobile' %>

<% render_with_layout 'view', 'mobile' %>

Answer

Correct Answer: <% render 'view', layout: 'mobile' %>

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20. How do you add Ruby code inside Rails views and have its result outputted in the HTML file?

Create an embedded Ruby file (.html.erb) and surround the Ruby code with <% %>.

Insert Ruby code inside standard HTML files and surround it with <% %>. The web server will handle the rest.

Create an embedded Ruby file (.html.erb) and surround the Ruby code with <%= %>.

Put the code in an .rb file and include it in a tag of an HTML file.

Answer

Correct Answer: Create an embedded Ruby file (.html.erb) and surround the Ruby code with <%= %>.

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21. In ActiveRecord, what is the difference between the has_many and has_many :through associations?

The has_many: through association is the one-to-many equivalent to the belongs_to one-to-one association.

Both associations are identical, and has_many: through is maintained only for legacy purposes.

The has_many association is a one-to-many association, while has_many: through is a one-to-one association that matches through a third model.

Both are one-to-many associations but with has_many :through, the declaring model can associate through a third model.

Answer

Correct Answer: Both are one-to-many associations but with has_many :through, the declaring model can associate through a third model.

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22. You are using an existing database that has a table named coffee_orders. What would the ActiveRecord model be named in order to use that table?

CoffeeOrders

Coffee_Orders

Coffee_Order

CoffeeOrder

Answer

Correct Answer: CoffeeOrder

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23. When using an ActiveRecord model, which method will create the model instance in memory and save it to the database?

Build

New

Create

Save

Answer

Correct Answer: Create

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24. What is the reason for using Concerns in Rails?

Concerns allow modularity and code reuse in models, controllers, and other classes.

Concerns are used to separate class methods from models.

Concerns are used to increase security of Rails applications.

Concerns are used to refactor Rails views.

Answer

Correct Answer: Concerns allow modularity and code reuse in models, controllers, and other classes.

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25. In Rails, how would you cache a partial template that is rendered?

Render partial: ‘shared/menu’, cached: true

Render_with_cache partial: ‘shared/menu’

Render partial: ‘shared/menu’

Render partial: ‘shared/menu’, cached_with_variables: {}

Answer

Correct Answer: Render partial: ‘shared/menu’, cached: true

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26. Given the URL helper product_path(@product), which statement would be expected to be false?

If sent using the PATCH HTTP method, the URL could be used to update a product in the database.

If sent using the POST HTTP method, the URL would create a new product in the database.

If sent using the GET HTTP method, the URL would execute the show action in ProductsController.

If sent using the DELETE HTTP method, the URL would call the destroy action by default.

Answer

Correct Answer: If sent using the POST HTTP method, the URL would create a new product in the database.

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27. For a Rails validator, how would you define an error message for the model attribute address with the message "This address is invalid"?

Model.errors = This address is invalid

Errors(model, :address) <<

Display_error_for(model, :address,

Model.errors[:address] <<

Answer

Correct Answer: Model.errors[:address] <<

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28. How would you generate a drop-down menu that allows the user to select from a collection of product names?

<%= select_tag(@products) %>

<%= collection_select(@products) %>

<%= collection_select(:product, :product_id, Product.all, :id, :name) %>

Answer

Correct Answer: <%= collection_select(:product, :product_id, Product.all, :id, :name) %>

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29. When a validation of a field in a Rails model fails, where are the messages for validation errors stored?

My_model.errors[:field]

My_model.get_errors_for(:field)

My_model.field.error

My_model.all_errors.select(:field)

Answer

Correct Answer: My_model.errors[:field]

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30. Are instance variables set within a controller method accessible within a view?

Yes, any instance variables that are set in an action method on a controller can be accessed and displayed in a view.

Yes, instance variables set within an action method are accessible within a view, but only when render is explicitly called inside the action method.

No, instance variables in a controller are private and are not accessible.

No, instance variables can never be set in a controller action method.

Answer

Correct Answer: Yes, any instance variables that are set in an action method on a controller can be accessed and displayed in a view.

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31. Which ActiveRecord query prevents SQL injection?

Product.where(

Answer

Correct Answer: Product.where(

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32. Which choice includes standard REST HTTP verbs?

GET, POST, PATCH, DELETE

REDIRECT, RENDER, SESSION, COOKIE

INDEX, SHOW, NEW, CREATE, EDIT, UPDATE, DESTROY

CREATE, READ, UPDATE, DELETE

Answer

Correct Answer: GET, POST, PATCH, DELETE

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33. In Rails, which code would you use to define a route that handles both the PUT and PATCH REST HTTP verbs?

Put :items, include: patch

Put 'items', to: 'items#update'

Match 'items', to 'items#update', via: [:put, :patch]

Match :items, using: put && patch

Answer

Correct Answer: Match 'items', to 'items#update', via: [:put, :patch]

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34. Which module can you use to encapsulate a cohesive chunk of functionality into a mixin?

ActiveSupport::Concern

RailsHelper.CommonClass

ActiveJob::Mixin

ActiveSupport::Module

Answer

Correct Answer: ActiveSupport::Concern

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35. What is before_action (formerly known as before_filter)?

A trigger that is executed before an alteration of an object's state

A method that is executed before an ActiveRecord model is saved

A callback that fires before an event is handled

A method in a controller that is executed before the controller action method

Answer

Correct Answer: A method in a controller that is executed before the controller action method

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36. Which statement correctly describes a difference between the form helper methods form_tag and form_for?

The form_tag method is for basic forms, while the form_for method is for multipart forms that include file uploads.

The form_tag method is for HTTP requests, while the form_for method is for AJAX requests.

The form_tag method typically expects a URL as its first argument, while the form_for method typically expects a model object.

The form_tag method is evaluated at runtime, while the form_for method is precompiled and cached.

Answer

Correct Answer: The form_tag method typically expects a URL as its first argument, while the form_for method typically expects a model object.

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37. Within a Rails controller, which code will prevent the parent controller's before_action :get_feature from running?

Skip_before_action :get_feature

Skip :get_feature, except: []

Prevent_action :get_feature

:redis_cache_store

Answer

Correct Answer: Skip_before_action :get_feature

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38. When rendering a partial in a view, how would you pass local variables for rendering?

<%= render partial:

Answer

Correct Answer: <%= render partial:

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39. What does the expression x ||= y mean?

x = y when x == false, otherwise x remains unchanged

x = y when x == true, otherwise x remains unchanged

x = y when y == true, otherwise x remains unchanged

Answer

Correct Answer: x = y when x == false, otherwise x remains unchanged

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40. Which of the following gems is used for authentication in Ruby on Rails? (check any that apply)

Devise

OmniAuth

Authlogic

None of these

Answer

Correct Answer: Devise
OmniAuth
Authlogic

Note: This question has more than 1 correct answers

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41.
What is the CGI Library? (check any that apply)

CGI data processing routines

Parses incoming form data

Part of the Ruby standard library

None of the above

Answer

Correct Answer: CGI data processing routines
Part of the Ruby standard library

Note: This question has more than 1 correct answers

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42.
The send_data method has the following options? send_data(data, options = {})

:filename Suggests a filename for the browser to use 

:type Specifies an HTTP content type. Defaults to ‘application/octet-stream’ 

:disposition Specifies whether the file will be shown inline or downloaded. Valid values are inline and attachment (default) 

:status Specifies the status code to send with the response. Defaults to ‘200 OK’

All of the above

Answer

Correct Answer: All of the above

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43.
Which of these codes will print correct date?

format('Birthday: #{month}/#{day}/#{year}', day: 14, month: 11, year: 1994) format('Birthday: %d/%d/%d', 11, 14, 1994)

format('Birthday: %{month}/%{day}/%{year}', day: 14, month: 11, year: 1994) format('Birthday: %{month}/%{day}/%{year}', 11, 14, 1994)

1st

2nd

3rd

4th

All of these

None of these

Answer

Correct Answer: 2nd
3rd

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44.
Which of these files are located by default in "config” directory? (check any that apply)

application.rb

config.ru

environment.rb

assets.rb

Answer

Correct Answer: application.rb
environment.rb

Note: This question has more than 1 correct answers

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45.
Which of these filters do no exist in Rails controller? (check any that apply)

before_action

after_action

skip_action_callback

skip_before_callback

skip_after_callback

Answer

Correct Answer: skip_action_callback
skip_before_callback
skip_after_callback

Note: This question has more than 1 correct answers

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46.
Which of these folders do not exist in folder “app” in Rails 5? (check any that apply)

assets

vendor

jobs

channels

services

Answer

Correct Answer: vendor
services

Note: This question has more than 1 correct answers

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47.
Which of these URL's will not be created by method resources :posts in routes.rb?

GET /posts

POST /posts/create

DELETE /posts/:id/delete

PATCH /posts/:id

Answer

Correct Answer: POST /posts/create
DELETE /posts/:id/delete

Note: This question has more than 1 correct answers

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48.
Which of these statements about Ruby on Rails 5 are false?

Added ActionCable

Rails API gem merged in core of Rails

Added ApplicationRecord top-level model

Relation "has_one" is required by default

Terminal command "rails" replaced by "rake"

Answer

Correct Answer: Relation "has_one" is required by default
Terminal command "rails" replaced by "rake"

Note: This question has more than 1 correct answers

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49.
Why would let() be used in rspec?

let() is being used as a kind of setup() and it relies on the relationships

Use it once and the result is persisted across the rspec tests.

let() is very slow and therefore is not generally used

let() always invoked before initialization

Answer

Correct Answer: let() always invoked before initialization

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50.
What is the SQL equivalent of following code? user=User.take(3)

SELECT *from users limit 1

SELECT *from users where users.id=3

SELECT *from users limit 3

SELECT *from users limit 2

Answer

Correct Answer: SELECT *from users limit 3

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51.
Which of the following code snippet can be used to include all javascript files?

<%= stylesheet_link_tag :all %>

<%= javascript_include_tag :defaults %>

<%= csrf_meta_tag %>

<%= link_to ... %>

Answer

Correct Answer: <%= javascript_include_tag :defaults %>

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52.
Which of the following code snippet can be used to include all javascript files?

http_basic_auth

http_basic_authenticate

http_basic_auth_with

http_basic_authenticate_with

Answer

Correct Answer: http_basic_authenticate_with

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53.
Which following command will you use in Updates Ruby in the latest version?

gem update

gem update –system

All of the above

Answer

Correct Answer: All of the above

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54.
While installing Ruby, why do you sometimes get a missing "psych” error?

It seems your Ruby installation is missing psych (for YAML output). To eliminate this warning, please install libyaml and reinstall your Ruby.

Ruby is not able to find yaml while installing.

All of the above

None of the above

Answer

Correct Answer: It seems your Ruby installation is missing psych (for YAML output). To eliminate this warning, please install libyaml and reinstall your Ruby.

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55.
Which of the following code is correct about Creating links

%= link_to “Button”, {:action => “action_name”,:id => product} :confirm => “some text here” %>

<%= link_to “Button”, {:action => “action_name”, :id => product}, :confirm => “some text here” %>

<%= link_to “Button”, {:action => “action_name”,id => product},confirm => “some text here” %>

<%= link_to “Button”, {:action = “action_name”,:id = product},:confirm = “some text here” %>

Answer

Correct Answer: <%= link_to “Button”, {:action => “action_name”, :id => product}, :confirm => “some text here” %>

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56.
What is the top-level model class added in Ruby on Rails 5?

ApplicationModel

ActiveModel

ApplicationRecord

BaseRecord

Answer

Correct Answer: ApplicationRecord

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57.
Which type of field is recommended for storing “enum" in Rails?

string

text

integer

decimal

Answer

Correct Answer: integer

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58.
Which of these servers is the default development server for Ruby on Rails 5?

Thin

Puma

WEBrick

Phusion Passenger

Answer

Correct Answer: Puma

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59.
Which of these model methods will be generated by this code? enum state: { blocked: 0, active: 1 }

Model.states

blocked?

active!

All of these

None of these

Answer

Correct Answer: Model.states

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60.
Which of these methods catch Exception in Rails controllers?

raise_from

rescue_from

catch_raise

catch_rescue

Answer

Correct Answer: rescue_from

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61.
Which of these routes is not generated by “resource :user”?

GET /user

GET /user/1

GET /user/new

PATCH /user

Answer

Correct Answer: GET /user/new

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62.
Which of the following open directly is correct about Open URI?

open('http://www.example.com') { data results => data.read }

open('http://www.example.com') { | data | results = data.read }

open('http://www.example.com') { data | results = data.open }

open(http://www.example.com) { data => results = data.read }

Answer

Correct Answer: open('http://www.example.com') { | data | results = data.read }

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63.
Which of these codes will raise an exception? class Person def name 'Andrew' end end # 1. person = Person.new person .name # 2. person = Person.new person. name # 3. Person .new .name # 4. Person .name

1st

2nd

3rd

4th

None of these

Answer

Correct Answer: None of these

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64.
Which of the following is the correct way to add a field in a signup that is not present in the User Model?

Use a nested attribute with the Devise Model.

Create a Controller.

It will throw Activerecord::UnknownAttributeError if try to add the other field.

It will throw Activerecord::UnknownModelField if try to add the other field.

Answer

Correct Answer: Use a nested attribute with the Devise Model.

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65.
Which of these expressions is equivalent to this code? a ||= "string"

a || a = "string"

a = "string" if a.blank?

a = "string" if !defined?(a) || !a

a = "string" if !defined?(a) || a.blank?

Answer

Correct Answer: a || a = "string"

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66.
Which of the following represents the inverse of a has_one association?

belong_to

has_none

belongs_to

None of the above

Answer

Correct Answer: belongs_to

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67.
In order to use optimistic locking, the table needs to have a column called ___________ of type integer.

lock_version

optimistic_version

lock_versions

lock

Answer

Correct Answer: lock_version

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68.
Which character is used to declare a global variable?

Answer

Correct Answer: $

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69.
Which notation is used to create class variables?

Answer

Correct Answer: @@

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70.
render method does not accept ________________

content_type

layout

location

formats

language

Answer

Correct Answer: language

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71.
Which method is used to render partial templates as part of a view?

view

show

render

partial

Answer

Correct Answer: render

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72.
Which of the following types of association is not supported by ActiveRecord?

one-to-one

one-to-many

many-to-one

many-to-many

Answer

Correct Answer: many-to-one

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73.
Which helper should be used when your model has association with other models and they also need to be validated?

validates_associated

confirmation

acceptance

associate_validated

Answer

Correct Answer: validates_associated

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74.
State whether True or False The find method will raise an ActiveRecord::RecordNotFound exception unless a matching record is found for all the supplied primary keys.

True

False

Answer

Correct Answer: True

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75.
What is the difference between find() and find_by_id() method?

find_by_id() will raise an error in case record does not exist for a given primary key whereas find() will not raise an error and will return nil

find() will raise an error in case record does not exist for a given primary key whereas find_by_id() will not raise an error and will return nil

Both are same

None of the above

Answer

Correct Answer: find() will raise an error in case record does not exist for a given primary key whereas find_by_id() will not raise an error and will return nil

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76.
How to disable protection of CSRF attacks for API requests?

protect_from_forgery with: :exception

protect_from_forgery with: :api_ingore

protect_from_forgery with: :null_session

protect_from_forgery with: :ignore

Answer

Correct Answer: protect_from_forgery with: :null_session

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77.
Which method is used in views to prevent CSRF attack?

csrf_prevent_meta_tag

csrf_protect_meta_tag

csrf_meta_tag

csrf_tag

Answer

Correct Answer: csrf_meta_tag

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78.
Which of the following methods can be used inside a controller to prevent CSRF attack?

protect_from_forgery

protect_from_csrf

prevent_from_forgery

prevent_from_csrf

Answer

Correct Answer: protect_from_forgery

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79.
What is the difference between Lambdas and procs?

Procs check the number of arguments passed and will return an error if you try to pass the wrong number while Lambdas set extra variables to nil

Lambdas check the number of arguments passed and will return an error if you try to pass the wrong number while Procs set extra variables to nil

Procs can handle a return function whereas Lambdas will return error

There is no difference as both are same

Answer

Correct Answer: Lambdas check the number of arguments passed and will return an error if you try to pass the wrong number while Procs set extra variables to nil

Note: This Question is unanswered, help us to find answer for this one

80.
Which file contains the database credentials of an RoR application?

config.yml

database.xml

database.yml

config.xml

Answer

Correct Answer: database.yml

Note: This Question is unanswered, help us to find answer for this one

81.
Which of the following rake commands can be used to load a schema.rb file into the database?

rake db:schema:dump

rake:db:schema:load

rake:db:migrate

rake:db:schema:clone

Answer

Correct Answer: rake:db:schema:load

Note: This Question is unanswered, help us to find answer for this one

82.
Which file contains the Gem requirements of an RoR App?

Gemfile

Rakefile

config

bundle

Answer

Correct Answer: config

Note: This Question is unanswered, help us to find answer for this one

83.
Which of the following command is used to list all the routes of an RoR application?

rake routes

rake route

bundle routes

routes

Answer

Correct Answer: rake routes

Note: This Question is unanswered, help us to find answer for this one

84.
Which of the following is used to achieve multiple inheritance in Ruby?

plugin

module

mixin

class

Answer

Correct Answer: mixin

Note: This Question is unanswered, help us to find answer for this one

85.
Which declaration can be used to override the default layout conventions in your controllers?

views

template

layout

partial

Answer

Correct Answer: layout

Note: This Question is unanswered, help us to find answer for this one

86.
Which of the following loops is not supported by Ruby?

While

For

Unless

Untill

Answer

Correct Answer: Unless

Note: This Question is unanswered, help us to find answer for this one

87.
The belongs_to association supports following options?
A) :autosavename, :class_id
B) :primary_key, :validate, :optional
C) :conuter_cache, :inverse_of, :foreign_key
D) :dependent, :polymorphic, :touch

B, C & D

Answer

Correct Answer: B, C & D

Note: This Question is unanswered, help us to find answer for this one

88.
The has_one association supports following options?

A):autoload, :validated

B):class_id, : foreign_name

C):dependent, :primary_key, :source_type

D):foreign_key, :inverse_of, :source

E)C,D

Answer

Correct Answer: E)C,D

Note: This Question is unanswered, help us to find answer for this one

89.
Which of these options for “dependent” do not exist in Rails?

:destroy

:nullify

:restrict_with_exception

:restrict_with_error

All of these options exist

Answer

Correct Answer: All of these options exist

Note: This Question is unanswered, help us to find answer for this one

90.
How is it possible to create combined unique index for two fields?

add_index :project_users, :user_id, combine_with: :project_id, unique: true

add_index :project_users, [:user_id, :project_id], unique: true

add_index :project_users, :user_id, unique: true add_index :project_users, :project_id, unique: true

add_index :project_users, :user_id, unique: true do add_index :project_users, :project_id, unique: true end

Answer

Correct Answer: add_index :project_users, [:user_id, :project_id], unique: true

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91.
How do you permit nester attributes in Rails controllers for such model? class User has_one :profile accepts_nested_attributes_for :profile end

params.require(:user).permit(:email, profile: [:id, :_destroy])

params.require(:user).permit(:email, profile: {:id, :_destroy})

params.require(:user).permit(:email, profile_attributes: [:id, :_destroy])

params.require(:user).permit(:email, profile_attributes: {:id, :_destroy})

Answer

Correct Answer: params.require(:user).permit(:email, profile_attributes: [:id, :_destroy])

Note: This Question is unanswered, help us to find answer for this one

92. Which of the following statements are correct about Types of Templates? (choose all that apply)

rxml,Files with Ruby code using the Builder library to generate XML

rhtml,They are HTML files with embedded Rails and they use the ERb library

rjs,Ruby code with Rails specific API that generate JavaScript.Used for Ajax functionality

All of the above

Answer

Correct Answer: rxml,Files with Ruby code using the Builder library to generate XML

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93.
The following methods skip validations, and will save the object to the database regardless of its validity?

A)update_all, update_attribute,update_column

B)decrement_counter, decrement!

C)increment!, update_counters

D)increment_count, update_tables

E)A,B,C

Answer

Correct Answer: E)A,B,C

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94.
What is the difference between "has_many :through" and "has_and_belongs_to_many"?

"has_many :through" requires an additional table in the database, whereas "has_and_belongs_to_many" does not

"has_many :through" requires an additional data model, whereas "has_and_belongs_to_many" does not

You should use "has_and_belongs_to_many" if you need validations, callbacks or extra attributes on the join model

No differences between these relations

Answer

Correct Answer: You should use "has_and_belongs_to_many" if you need validations, callbacks or extra attributes on the join model

Note: This Question is unanswered, help us to find answer for this one

95.
What is the purpose of using below code in filter_parameter_logging.rb? Rails.application.config.filter_parameters += [:password]

Remove “password” from input parameters

Disallow to send “password” via GET request

Hide "password" parameter in applications logs

Automatically trim whitespaces of “password” parameter

Answer

Correct Answer: Hide "password" parameter in applications logs

Note: This Question is unanswered, help us to find answer for this one

96.
A controller is a server-side _____ of Rails that responds to external requests from the web server to the application?

Script

Component

Data

View

Answer

Correct Answer: Component

Note: This Question is unanswered, help us to find answer for this one

97.
In Ruby on Rails, an action is typically a basic ____ that describes how to respond to a specific external web-browser request?

Unit

Render

Helper

Controller

Answer

Correct Answer: Unit

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98.
Which of the following instances are variables in your functional tests? (check any that apply)

@controller - The controller processing the request

@request - The request object

@response - The response object

@posts – The post object

Answer

Correct Answer: @controller - The controller processing the request
@request - The request object
@response - The response object

Note: This question has more than 1 correct answers

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99.
What are the Available callbacks? (check any that apply)

around_enqueue

after_enqueue

before_perform

around_perform

None of the above

Answer

Correct Answer: around_enqueue
after_enqueue
before_perform
around_perform

Note: This question has more than 1 correct answers

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100.
Which of these is not a valid Bundler command?

bundle exec

bundle console

bundle config

bundle deps

Answer

Correct Answer: bundle deps

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101.
What are the asset tag helpers available in Rails? (check any that apply)

auto_discovery_link_tag

javascript_link_tag

stylesheet_link_tag

image_tag

All of the above

Answer

Correct Answer: auto_discovery_link_tag
stylesheet_link_tag
image_tag

Note: This question has more than 1 correct answers

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102.
The following methods trigger validations, and will save the object to the database only if the object is valid? (check any that apply)

create

create!

update

update!

None of the above

Answer

Correct Answer: create
create!
update

Note: This question has more than 1 correct answers

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103.
Calls to the render method generally accept using the following options?

A):content_id

B):layout_type

C):location

D):status and :formats

E)C,D

Answer

Correct Answer: E)C,D

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104.
What is the lowest version of Ruby supported by Ruby on Rails 5?

Ruby 2.0.0

Ruby 2.1.9

Ruby 2.2.2

Ruby 2.3.0

Answer

Correct Answer: Ruby 2.2.2

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105.
Which of the following statements is correct?

:rel specifies the rel value in the link. The default value is "alternate"

:type specifies an explicit MIME type. Rails will generate an appropriate MIME type automatically

:title specifies the title of the link. The default value is the uppercase:type value, for example, "ATOM" or "RSS"

All of the above

Answer

Correct Answer: All of the above

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106.
Please select the True statements from the following:

ActiveRecord - Talks to the database system and creates Ruby objects modeled on the database tables

ActionController - Manipulates ActiveRecord objects, loads data into variables for use in ActionView templates and uses CGI library to process form data held in CGI variables

ActionView - Fills ERB templates with data processed by ActionController, then hands the resulting HTML to the Web server

Support libraries, ActiveRecord ActionWebServices ActionMail

All of the above

Answer

Correct Answer: ActiveRecord - Talks to the database system and creates Ruby objects modeled on the database tables
ActionController - Manipulates ActiveRecord objects, loads data into variables for use in ActionView templates and uses CGI library to process form data held in CGI variables
ActionView - Fills ERB templates with data processed by ActionController, then hands the resulting HTML to the Web server

Note: This question has more than 1 correct answers

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107.
Which of the following types of callbacks are available in ROR?

A) (1) before_validated (2) after_validated

B) (3) before_save (4) before_create

C) (5) after_create (6) after_save (7) after_commit

D) B & C

Answer

Correct Answer: D) B & C

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108.
What is the difference between jruby and ruby?

Ruby is a programming language. JRuby is an implementation of the Ruby programming language.

JRuby is the ruby implementation that runs on a JVM whereas Matz's ruby is a C implementation.

All of the above.

None of the above.

Answer

Correct Answer: All of the above.

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109.
Which of these options is right to create default scope of model in Rails?

scope, -> { order(:position) }

scope :default, -> { order(:position) }

default_scope -> { order(:position) }

default_scope, -> { order(:position) }

Answer

Correct Answer: default_scope -> { order(:position) }

Note: This Question is unanswered, help us to find answer for this one

110.
Which of these files determine Ruby version and gemset for RVM library?

.rb-version, .rb-gemset

.ruby-version, .ruby-gemset

.version, .gemset

.rvm-version, .rvm-gemset

Answer

Correct Answer: .ruby-version, .ruby-gemset

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111.
Which of the following statements is true regarding the find_or_create method in Ruby on Rails?

It can find multiple arguments by using Model.find_or_create_by_name('name here'). It will first find the record and if it doesn't exist it will create it.

It cannot be used in Ruby on Rails.

It is similar to the find query.

It is similar to the create query.

Answer

Correct Answer: It can find multiple arguments by using Model.find_or_create_by_name('name here'). It will first find the record and if it doesn't exist it will create it.

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112.
Which of the following protects "NOT NULL" fields against missing a user input?

validates_acceptance_of

validates_presence_of

validates_numericality_of

validates_confirmation_of

Answer

Correct Answer: validates_presence_of

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113.
Which of the following is not an advantage of using an integrated development environment (IDE) for Rails ,compared with using a simple text editor?

automated code analysis

assisted refactoring

smaller memory footprint

integrated version control

Answer

Correct Answer: smaller memory footprint

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114.
How can the Heroku deprecation warning be removed from a Rails plugin that has been used?

ActiveSupport::Deprecation.silenced = true

Can be done in production.rb config.plugins = [ :rails_serve_static_assets ] # ONLY load static assets plugin

Both A and B

None of the above

Answer

Correct Answer: ActiveSupport::Deprecation.silenced = true

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115.
What is TDD is rails3?

TDD directs focus on testing.

TDD directs focus on behavior and specification.

Both A and B

None of them is correct

Answer

Correct Answer: TDD directs focus on testing.

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116.
Which of these tools are for checking Ruby code styling?

CodeClimate

Brakeman

Rubocop

SimpleCov

Answer

Correct Answer: Rubocop

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117.
The asset tag helpers do not verify the existence of the assets at the specified locations.

True

False

Answer

Correct Answer: True

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118.
Which of the following validations are supported by models?

Presence validation

Length validation

Format validation

Database uniqueness validation

Answer

Correct Answer: Presence validation

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119.
After executing the following code, what will the value of foo be? foo = 'bar' wom = Proc.new {|foo| foo = 'baz'} wom.call('pling')

"pling"

"bar"

"baz"

Answer

Correct Answer: "bar"

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120.

Which of the following will return a User object when used with a model which deals with a table named User?

User.new

User.destroy

User.find

User.save

Answer

Correct Answer: User.new

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121.

Which of the following options will correctly show an image in the HTML ERB template in Rails?

<%= image_tag("logo.png", :alt=>"Sample Logo", :class=>"round" %>

<%= image_tag(:src=>"logo.png", :alt=>"Sample Logo", :class=>"round" %>

<%= image_tag("logo.png", alt=>"Sample Logo", class=>"round" %>

<%= img_tag("logo.png", :alt=>"Sample Logo", :class=>"round" %>

Answer

Correct Answer: <%= image_tag("logo.png", :alt=>"Sample Logo", :class=>"round" %>

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122.
Which of the following validations checks if a passed value is an enumeration and falls in the given range?

validates_associated

validates_inclusion_of

validates_exclusion_of

validates_numericality_of

Answer

Correct Answer: validates_inclusion_of

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123.
Which of the following will change a Rails 3 app to run in production mode?

rails s -p production

rails s -e production

rails s production

rails s -p PRODUCTION

Answer

Correct Answer: rails s -e production

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124.
Given below are two statements regarding Rails testing: Statement X: Unit tests are used to test models. Statement Y: Functional tests are used to test controllers. Which of the following statements is true?

Statement X is correct, but statement Y is incorrect.

Statement X is incorrect, but statement Y is correct.

Both statements X and Y are correct.

Both statements X and Y are incorrect.

Answer

Correct Answer: Both statements X and Y are correct.

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125.
During the deployment of the Rails application through Git, you want certain files to be ignored. Which of the following files performs that operation?

.gitignore

config.ru

Gemfile

Rakefile

Answer

Correct Answer: .gitignore

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126.
In a Rails application, a Gemfile needs to be modified to make use of sqlite3-ruby gems. Which of the following options will use these gems, as per the new Gemfile?

install bundle Gemfile

bundle install

mate Gemfile

gem bundle install

Answer

Correct Answer: bundle install

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127.
Which of the following options will create a new Rails application with default templates?

rails new <application _name>

rails create <application_name>

rails server <application_name>

rails generate <application_name>

Answer

Correct Answer: rails new <application _name>

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128.
If we need to associate one model with many others, what associations should we use?

has_and_belongs_to_many

has_many, belongs_to

has_one, belongs_to

Answer

Correct Answer: has_many, belongs_to

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129.
Which of the following options will create a many-to-many relation between the 'users' and the 'jobs' tables?

users_jobs

users_many_jobs

many_users_many_jobs

Answer

Correct Answer: users_jobs

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130.
For the String class, when using #gsub! what are the potential return values?

The string instance

nil

nil or the string instance

Answer

Correct Answer: nil or the string instance

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131.
What is the purpose of the model in an MVC architecture framework such as Ruby on Rails?

The model houses all the code that relates to data.

The model contains the minimum amount of code to display data.

Methods in the model can be directly accessed in Rails views.

The model performs parsing user requests, data submissions, cookies, sessions and other web browser operations.

Answer

Correct Answer: The model houses all the code that relates to data.

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132.
Which of the following statements regarding models in Ruby on Rails is correct?

The page HTML is generated by models.

The fetching of data from database is performed by models.

The web requests sent by the browser is handled by models.

The routing configuration is done by models.

Answer

Correct Answer: The fetching of data from database is performed by models.

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133.
Which of the following actions is fired by default when a new controller is created?

index

run

show

Answer

Correct Answer: index

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134.
Which of the following options is used to create a form HTML in the erb files?

form_for

create_form

form_do

form

Answer

Correct Answer: form_for

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135.
The =~ operator is used to do inline Regular Expression matching, for instance:
"function" =~ /fun/
"function" =~ /dinosaurs/
What are possible return values for the =~ matcher?

true, false

"fun", nil

1 and 0 only

0 and nil only

nil, 0, and any positive integer

Answer

Correct Answer: nil, 0, and any positive integer

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136.
Which of the following options will disable the rendering of the view associated with a controller action?

render :layout=>false

render :layout=>nil

render :layout=>disabled

render :layout=>off

Answer

Correct Answer: render :layout=>false

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137.
What is the output of the following code?
$val = 20
print "Sample Text\n" if $val

Sample Text

No output

Syntax error

Answer

Correct Answer: Sample Text

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138.
If a model called BlogComment is defined, what would its DB table be blog_commentcalled?

blog_comment

blogcomments

blog_comments

Answer

Correct Answer: blog_comments

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139.
Consider the following information for a User view:
user_path named route with value "/users/"
@user = 1
Now, consider the following code in the HTML erb template:
<%= link_to user_path(@user), "Angel" %>
What will be the HTML output of this code?

a href='/users/1'>Angel</a

a href='Angel'>/users/1</a

a href='/users/1'>/users/1</a

a href='Angel'>Angel</a

Answer

Correct Answer: a href='/users/1'>Angel</a

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140.
There is a table named Product in a Rails application. The program is required to fetch any 5 rows where the productid is 2. Which of the following is the correct option to perform this action?

Product.find(:productid=>2), :offset=>5

Product.find(:productid=>2), :limit=>5

Product.find(:productid=>2), :only=>5

Answer

Correct Answer: Product.find(:productid=>2), :limit=>5

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141.
What is the behavior of class variables with subclasses?

Subclasses inherit a default value for the class variable, which can then be modified for just the subclass.

Class variables are shared between between all classes in the hierarchy.

Class variables are not inherited.

Answer

Correct Answer: Class variables are shared between between all classes in the hierarchy.

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142.
Which of the following is true about writing tests for a Ruby on Rails application?

Rails semi-automates the process of writing tests. It starts by producing skeleton test code in the background while models and controllers are being written.

Running tests in Rails ensures that the code adheres to the desired functionality even after major code refactoring.

Rails tests can simulate browser requests, and thus test the application's response without having to test it through a browser.

All of these.

Answer

Correct Answer: Rails semi-automates the process of writing tests. It starts by producing skeleton test code in the background while models and controllers are being written.

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143.
Rails automatically requires certain files in an application. Which of the following files are automatically included without an explicit 'require' being necessary?

All files in lib.

All files in models, views, controllers, and files named rails.rb in lib.

All files in models, views, controllers, and any init.rb in plugins.

Only files explicitly referenced from an initializer in config/initializers.

Answer

Correct Answer: All files in models, views, controllers, and any init.rb in plugins.

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144.
Which of the following controller actions (by default) are best suited to handle the GET HTTP request?

index

show

create

edit

update

Answer

Correct Answer: index

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145.
For the String class, what's the difference between "#slice" and "#slice!"?

None, "#slice" is just an alias for "#slice!".

There is no "#slice!" method in Ruby on Rails.

"#slice" returns a new object, "#slice!" destructively updates — mutates — the object's value.

Answer

Correct Answer: "#slice" returns a new object, "#slice!" destructively updates — mutates — the object's value.

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146.
What is output of following statements?
1) "".nil? == "".empty? && "".blank? == "".empty?
2) !"".nil? == "".empty? && "".blank? == "".empty?
3) nil.nil? == nil.empty? && nil.blank? == nil.empty?
4) !"".blank? == "".present?
5) "".any? == !"".empty?
6) " ".blank? == " ".empty?

1) false 2) true 3) NoMethodError: undefined method `empty?' for nil:NilClass 4) true 5) NoMethodError: undefined method `any?' for "":String 6) false

1) false 2) NoMethodError: undefined method `empty?' for "":String 3) true 4) true 5) NoMethodError: undefined method `any?' for "":String 6) false

1) false 2) true 3) true 4) true 5) false 6) false

1) false 2) true 3) false 4) true 5) true 6) false

Answer

Correct Answer: 1) false 2) true 3) false 4) true 5) true 6) false

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147.
Using ERB for views, what filename should be given to a partial called 'login'?

partial_login.e

_login.html.e

Answer

Correct Answer: _login.html.e

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148.
Which of the following validations in Rails checks for null fields?

validates_presence_of

validates_length_of

validates_confirmation_of

validates_uniqueness_of

Answer

Correct Answer: validates_presence_of

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149.
What does the 4xx series of HTTP errors represent?

They are intended for cases in which the server seems to have encountered an error.

They are intended for cases in which the client seems to have encountered an error.

They indicate that further action needs to be taken by the user agent in order to fulfill the request.

They indicate that no further action can be taken by the user agent.

Answer

Correct Answer: They are intended for cases in which the client seems to have encountered an error.

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150.
How can a partial called "cart" be rendered from a controller called "ProductsController", assuming the partial is in a directory called "shared"?

render :partial => 'shared/cart'

partial 'shared/cart'

render 'cart'

Answer

Correct Answer: render :partial => 'shared/cart'

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151.
Which of the following correctly handles the currency field?
A) add_column :items, :price, :decimal, :precision => 8, :scale => 2
B) add_money :items, :price, currency: { present: false }

Both A and B are correct.

Both A and B are incorrect.

Answer

Correct Answer: A

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152.
What is the convention for methods which end with a question mark?
e.g. #all?, #kind_of?, directory?

They should always require arguments.

They should always return a boolean value.

They should always report a value of the object they're being called on.

Answer

Correct Answer: They should always return a boolean value.

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153.
In a Rails application, the developmental and production configuration are stored in the:

config/environments folder

public folder

spec folder

task folder

Answer

Correct Answer: config/environments folder

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154.
Which of the following is not a built-in Rails caching strategy used to reduce database calls?

Page Caching

Fragment Caching

Object Caching

Query Caching

Answer

Correct Answer: Object Caching

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155.
Select all incorrect statements regarding the Ruby Version Manager (RVM):

RVM is a command-line tool which allows developers to easily install, manage, and work with multiple Ruby environments from interpreters to sets of gems.

RVM provides a revision control tool to maintain current and historical versions of files such as source code, web pages, and documentation.

Test suites, rake tasks, benchmarks and gem commands can be run against multiple Ruby versions at the same time with RVM.

RVM cannot automate the installation and maintenance of gems, it has to be done manually.

Answer

Correct Answer: RVM provides a revision control tool to maintain current and historical versions of files such as source code, web pages, and documentation.

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156.
When a new controller named "admin2" is created, the JS and the CSS files are created in:

controllers

helpers

assets

views

Answer

Correct Answer: assets

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157.
Which of the following is not true about log levels in Ruby on Rails?

The available log levels are: :debug, :info, :warn, :error, and :fatal, corresponding to the log level numbers from 1 up to 5 respectively.

To check the current log level, the Rails.logger.level method has to be called.

By default, each log is created under Rails.root/log/ and the log file name is environment_name.log.

The default Rails log level is error in production mode and debug in development and test mode.

Answer

Correct Answer: The available log levels are: :debug, :info, :warn, :error, and :fatal, corresponding to the log level numbers from 1 up to 5 respectively.

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158.
With the two models Hive and Bee; when creating a belongs_to association from the Bee model to Hive, what is the foreign key generated on Bee?

hive_id

hives_id

ee_id

Answer

Correct Answer: hive_id

Note: This Question is unanswered, help us to find answer for this one

159.
What does REST stand for?

Ruby Enclosed Standard Templating

Resource Standard Transfer

REasonable Standards Testing

REpresentational State Transfer

Rights Enabled Safety Tunnel

Answer

Correct Answer: REpresentational State Transfer

Note: This Question is unanswered, help us to find answer for this one

160.
Users who are new to MVC design often ask how to query data from Views. Is this possible? And if so, is this a good idea?

It is not possible, because ActiveRecord queries cannot be made from Views.

It is not possible, because Controllers do not provide enough information to the Views.

It is possible, but it is a bad idea because Views should only be responsible for displaying objects passed to them.

Answer

Correct Answer: It is possible, but it is a bad idea because Views should only be responsible for displaying objects passed to them.

Note: This Question is unanswered, help us to find answer for this one

161.
What is the Singleton design pattern?

A class for which there is only ever one instance.

A single feature application, intended to enhance usability by keeping things simple.

A class which is never instanced, but acts as a container for methods which are used by it's subclasses.

Answer

Correct Answer: A class for which there is only ever one instance.

Note: This Question is unanswered, help us to find answer for this one

162.
Which of the following statements is incorrect?

Rails does not support ODBC connectivity.

Rails can rollback database changes in development mode.

Rails can work and connect with multiple databases.

Rails database information is stored in the database.yml file.

Answer

Correct Answer: Rails does not support ODBC connectivity.

Note: This Question is unanswered, help us to find answer for this one

163.
Which of the following serves as a structural skeleton for all HTML pages created?

application.html.erb

default.html.erb

index.html.erb

layout.html.erb

Answer

Correct Answer: application.html.erb

Note: This Question is unanswered, help us to find answer for this one

164.
If a controller is named "Users", what would its helpers module be called?

UsersHelper

UserControllerHelper

UserHelp

Answer

Correct Answer: UsersHelper

Note: This Question is unanswered, help us to find answer for this one

165.
Consider the following code snippet:
def index
render
end
The corresponding index.html.erb view is as following:
<html>
<head>
<title>Ruby on Rails sample application | <%=@title%></title>
</head>
<body></body>
</html>
Which of the following options is correct?

The application will give an exception as @title variable is not defined in the controller.

The HTML page will render with the title: Ruby on Rails sample application | <%=@title%>.

The HTML page will render with the title: Ruby on Rails sample application |.

The HTML page will render with the title: Ruby on Rails sample application.

Answer

Correct Answer: The application will give an exception as @title variable is not defined in the controller.

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166.
Which of the following commands will test a particular test case, given that the tests are contained in the file test/unit/demo_test.rb, and the particular test case is test_one?

$ ruby -Itest test/unit/demo_test.rb -n test_one

$ ruby -Itest test/unit/demo_test.rb -a test_one

$ ruby -Itest test/unit/demo_test.rb test_one

$ ruby -Itest test/unit/demo_test.rb -t test_one

Answer

Correct Answer: $ ruby -Itest test/unit/demo_test.rb -a test_one

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167.
Which of the following will disable browser page caching in Rails?

expire_page(:controller => 'products', :action => 'index')

expire_fragment(:controller => 'products', :action => 'index')

expire_page_fragment('all_available_products')

expire_fragment('all_available_products')

Answer

Correct Answer: expire_page(:controller => 'products', :action => 'index')

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168.
In a Rails Migration, which of the following will make a column unique, and then have it indexed?

add_index :table_name, :column_name, :unique => true

add_index :unique => true ,:table_name, :column_name

add_index :table_name, [:column_name_a, :unique => true ,:column_name_b], :unique => true

None of these

Answer

Correct Answer: add_index :table_name, :column_name, :unique => true

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169.
If a float is added to an integer, what is the class of the resulting number? i.e. 1.0 + 2

Integer

Float

BigDecimal

Answer

Correct Answer: Float

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170.
In order to enable locking on a table, which of the following columns is added?

lock_version column

identity column

primary key column

lock_optimistic column

Answer

Correct Answer: lock_version column

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171.
Which is the best way to add a page-specific JavaScript code in a Rails
3 app?
<%= f.radio_button :rating, 'positive', :onclick => "$('some_div').show();"
%>

<% content_for :head do %> <script type="text/javascript"> <%= render :partial => "my_view_javascript" </script> <% end %> Then in layout file <head> ... <%= yield :head %> </head>

In the application_helper.rb file: def include_javascript (file) s = " <script type=\"text/javascript\">" + render(:file => file) + "</script>" content_for(:head, raw(s)) end Then in your particular view (app/views/ books/index.html.erb in this example) <% include_javascript 'books/ index.js' %>

In the controller: def get_script render :file => 'app/assessts/javascripts/' + params[:name] + '.js' end def get_page @script = '/' + params[:script_name] + '.js?body=1' render page end In View <script type="text/javascript",:src => @script>

None of these

Answer

Correct Answer: None of these

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172.
Which of the following is the correct syntax for an input field of radio buttons in form_for?

<%= f.radio_button :contactmethod, 'sms' %>

<%= f.radio_button_tag :contactmethod, 'sms' %>

<%= radio_button_tag :contactmethod, 'sms' %>

<%= f.radio_button "contactmethod", 'sms' %>

Answer

Correct Answer: <%= f.radio_button :contactmethod, 'sms' %>

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173.
Which of the following is the correct way to rollback a migration?

A migration cannot be rollbacked.

rake db:rollback STEP=N (N is the migration number to be rollbacked)

rake db:migrate:reset: (N) (N is the migration number to be rollbacked)

rake db:rollback migration=N (N is the migration number to be rollbacked)

Answer

Correct Answer: rake db:rollback STEP=N (N is the migration number to be rollbacked)

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174.
Which of the following methods is used to check whether an object is valid or invalid?

.valid? and .invalid?

valid() and invalid()

isvalid and isinvalid

Answer

Correct Answer: .valid? and .invalid?

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175.
What is the difference between :dependent => :destroy and :dependent => :delete_all in Rails?

There is no difference between the two; :dependent => :destroy and :dependent => :delete_all are semantically equivalent.

In :destroy, associated objects are destroyed alongside the object by calling their :destroy method, while in :delete_all, they are destroyed immediately, without calling their :destroy method.

In :delete_all, associated objects are destroyed alongside the object by calling their :destroy method, while in :destroy, they are destroyed immediately, without calling their individual :destroy methods.

None of these.

Answer

Correct Answer: In :destroy, associated objects are destroyed alongside the object by calling their :destroy method, while in :delete_all, they are destroyed immediately, without calling their :destroy method.

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176.
Suppose a model is created as follows:
rails generate model Sales
rake db:migrate
What would be the best way to completely undo these changes, assuming
nothing else has changed in the meantime?

rails reset models; rake db:rollback

rails destroy model Sales; rake db:rollback

rake db:rollback; rails rollback model Sales

rake db:rollback; rails destroy model Sales

Answer

Correct Answer: rake db:rollback; rails destroy model Sales

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177.
What is the output of the following code?
puts "aeiou".sub(/[aeiou]/, '*')

*****

*eiou

nil

Answer

Correct Answer: *eiou

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178.
What declaration would you use to set the layout for a controller?

layout 'new_layout'

set_layout 'new_layout'

@layout = 'new_layout'

Answer

Correct Answer: layout 'new_layout'

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179.
Which of the following options, when passed as arguments, skips a particular validation?

:validate => skip

:validate => off

:validate => disable

:validate => false

Answer

Correct Answer: :validate => false

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180.
Which of the following is the default way that Rails seeds data for tests?

Data Migrations

Factories

Fixture Factories

Fixtures

Answer

Correct Answer: Fixtures

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181.
Which of the following is the correct way to skip ActiveRecords in Rails 3?

ActiveRecords cannot be skipped.

Use option -O while generating application template.

Use option -SKIP_AR while generating the application template.

Add new line SKIP: ACTIVERECORD in config.generators.

Answer

Correct Answer: Add new line SKIP: ACTIVERECORD in config.generators.

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182.
Choose the best way to implement sessions in Rails 3:
A) Using CookieStore
B) By creating a session table and setting config/initializers/
session_store.rb with
Rails.application.config.session_store :active_record_store
C) By setting config/initializers/session_store.rb with
Rails.application.config.session_store :active_record_store only

B and C

Answer

Correct Answer: B

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183.
Given below are two statements regarding the Ruby programming
language:
Statement X: "redo" restarts an iteration of the most internal loop, without
checking loop condition.
Statement Y: "retry" restarts the invocation of an iterator call. Also,
arguments to the iterator are re-evaluated.
Which of the following options is correct?

Statement X is correct, but statement Y is incorrect.

Statement X is incorrect, but statement Y is correct.

Both statements are correct.

Both statements are incorrect.

Answer

Correct Answer: Statement X is incorrect, but statement Y is correct.

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184.
Which of the following commands will clear out sample users from the development database?

rake db:migrate

rake db:reset

rake db:rollback

Answer

Correct Answer: rake db:reset

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185.
Is an AJAX call synchronous or asynchronous?

Asynchronous

Synchronous

Either; it is configurable

Answer

Correct Answer: Either; it is configurable

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186.
Which of the following assertions are used in testing views?

assert_valid

assert_select_email

assert_select_encoded

css_select

Answer

Correct Answer: assert_select_email

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187.
What is green-threading?

A design pattern where a fixed-size pool of threads is shared around a program.

When threads are emulated by a virtual machine or interpreter.

Where programs are run across multiple CPUs.

Answer

Correct Answer: When threads are emulated by a virtual machine or interpreter.

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188.
If a method #decoupage(n) is described as O(n^2), what does that mean?

The fewest number of operations it will perform is n*n.

The worst case run time is proportional to the size of the square of the method's input.

The method operates by squaring the input.

The return value for the method will be the length of the input squared.

Answer

Correct Answer: The worst case run time is proportional to the size of the square of the method's input.

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189.
Which of the following replaced the Prototype JavaScript library in Ruby on Rails as the default JavaScript library?

jQuery

Ajax

Script.aculo.us

ajax-li

Answer

Correct Answer: jQuery

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190.
What component of Rails are tested with unit tests?

Models

Controllers

View helpers

Answer

Correct Answer: Models

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191.
What exception cannot be handled with the rescue_from method in the
application controller?
e.g
class ApplicationControllers < ActionController::Base
rescue_from Exception, with: error_handler
..........

end

Server errors

Record not found (404)

Routing errors

All of these

Answer

Correct Answer: All of these

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192.
Which gem is used to install a debugger in Rails 3?

gem 'ruby-debug1'

gem "ruby-debug19"

gem "debugger19"

gem "ruby-debugger"

Answer

Correct Answer: gem "ruby-debug19"

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193.
What is the output of the following code in Ruby?
x= "A" + "B"
puts x
y= "C" << "D"
puts y

AB CD

AB C

AB D

AB DC

Answer

Correct Answer: AB CD

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194.
Which of the following items are stored in the models subdirectory?

helper classes

database classes

HTML layout templates

Config files

Answer

Correct Answer: database classes

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195.
Which part of the MVC stack does ERB or HAML typically participate in?

Class

Controller

Model

Module

View

Answer

Correct Answer: View

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196.
Given the following code, where is the "party!" method available?
module PartyAnimal
def self.party!
puts "Hard! Better! Faster! Stronger!"
end
end
class Person
include PartyAnimal
end

PartyAnimal.party!

Person.party!

Person.new.party!

Both PartyAnimal.party! and Person.party!

None of these

Answer

Correct Answer: PartyAnimal.party!

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197.
where we use attr_accessor and attr_accessible in rails ?

controller

helper

model

view

Answer

Correct Answer: model

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198.
What is the recommended Rails way to iterate over records for display in a view?

Implicitly loop over a set of records, and send the partial being rendered a :collection.

Use each to explicitly loop over a set of records.

Use for to fetch individual records explicitly in a loop.

Answer

Correct Answer: Implicitly loop over a set of records, and send the partial being rendered a :collection.

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199.
What is best way to create primary key as a string field instead of integer in rails.

when creating a new table don't add primary key using this create_table users, :id => false do |t| t.string :id, :null => false ...... end execute("ALTER TABLE users ADD PRIMARY KEY (id)") if not using id as primary key then in users model add the following line class User < ActiveRecord::Base self.primary_key = "column_name" .... end

you can add a key to column name to make it primary create_table users :id => false do |t| t.string :column_name, :primary => true end

Answer

Correct Answer: when creating a new table don't add primary key using this create_table users, :id => false do |t| t.string :id, :null => false ...... end execute("ALTER TABLE users ADD PRIMARY KEY (id)") if not using id as primary key then in users model add the following line class User < ActiveRecord::Base self.primary_key = "column_name" .... end

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200.
Which of the following is the correct way to know the Rails root directory path?

RAILS_ROOT

Rails.root

Rails.root.show

Rails.show.root

Answer

Correct Answer: Rails.root

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201.
What is difference between "has_one" and "belong_to"?

"has_one" should be used in a model whose table have foreign keys while "belong_to" is used with an associated table.

"belong_to" should be used in a model whose table have foreign keys while "has_one" is used with an associated table.

The two are interchangeable.

None of these.

Answer

Correct Answer: "belong_to" should be used in a model whose table have foreign keys while "has_one" is used with an associated table.

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202.
What is the output of the following Ruby code?
puts "The multiplication output of 10,10,2 is #{10102}"

200.

The multiplication output of 10,10,2 is #{10*10*2}.

The multiplication output of 10,10,2 is 200.

The code will give a syntax error.

Answer

Correct Answer: The multiplication output of 10,10,2 is 200.

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203.
Which of the following choices will write routes for the API versioning scenario described below?

/api/users returns a 301 to /api/v2/users
/api/v1/users returns a 200 of users index at version 1
/api/v3/users returns a 301 to /api/v2/users
/api/asdf/users returns a 301 to /api/v2/users

namespace :api do namespace :v1 do resources :users end namespace :v2 do resources :users end match 'v:api/*path', :to => redirect("/api/v2/%{path}") match '*path', :to => redirect("/api/v2/%{path}") end

namespace :api do resources :users end namespace :v2 do resources :users end match 'v:api/*path', :to => redirect("/api/v1/%{path}") match '*path', :to => redirect("/api/v1/%{path}") end

namespace :api do scope :module => :v3, &current_api_routes namespace :v3, &current_api_routes namespace :v2, &current_api_routes namespace :v1, &current_api_routes match ":api/*path", :to => redirect("/ api/v3/%{path}") end

None of these

Answer

Correct Answer: namespace :api do namespace :v1 do resources :users end namespace :v2 do resources :users end match 'v:api/*path', :to => redirect("/api/v2/%{path}") match '*path', :to => redirect("/api/v2/%{path}") end

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204.
Which of the following code samples will get the index of |page| inside of a loop?

<% @images.each.do |page,index| %> <% end %>

<% @images.each_with_index do |page, index| %> <% end %>

<% @images.collect.each.at_index do |page, index| %> <% end %>

None of these

Answer

Correct Answer: <% @images.each_with_index do |page, index| %> <% end %>

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205.
What is the difference between _url and _path while being used in routes?

_url is absolute while _path is relative.

_path is relative while _path is absolute.

_path is used in controllers while _url is used in views.

_path is used in views while _url is used in controllers.

Answer

Correct Answer: _url is absolute while _path is relative.

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206.
When using full-page caching, what happens when an incoming request matches a page in the cache?

The web-server serves the file directly from disk, bypassing Rails.

Rails checks to see if there is a cached page on disk and passes it onto the server.

Rails checks its in-memory cache and passes the page onto the server.

Answer

Correct Answer: Rails checks to see if there is a cached page on disk and passes it onto the server.

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207.
What is the output of the following code?
test*5

type casting error

test5

testtesttesttesttest

Answer

Correct Answer: testtesttesttesttest

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208.
In a has_many association, what is the difference between build and new?
// user.rb
has_many :posts
// post.rb
belongs_to :user

'new' sets the foreign key while 'build' does not.

'build' sets the foreign key while 'new' does not.

'build' sets the foreign key and adds it to the collection.

'new' sets the foreign key and adds it to the collection.

Answer

Correct Answer: 'build' sets the foreign key and adds it to the collection.

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209.
Which of the following HTML template languages are supported by Ruby?

Embedded Ruby

HAML

Mustache

Razor

Answer

Correct Answer: Embedded Ruby

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210.
Which of the following commands adds the data model info to the model file?

bundle install

generate model

annotate

Rails server

Answer

Correct Answer: generate model

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211.
How can a value be stored so that it's shared across an entire request (i.e. make it accessible in controllers, views and models)?

Put it in a global variable.

Create a Singleton and stored it in a class variable.

Store it in a thread locally.

Answer

Correct Answer: Store it in a thread locally.

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212.
In the case of Rails application performance optimization, select all valid ways to do assets compilation:

Running the rake task with the assets:precompile parameter when CSS and JavaScript files are updated.

Set a true value for the config.assets.compile parameter in the config/ environments/production.rb file.

Implementing the Rails asset pipeline feature to minify JavaScript & CSS assets.

All of these.

Answer

Correct Answer: All of these.

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213.
Which of the following options in the Ruby on Rails MVC architecture handles the dynamic data and the classes with the database?

Models

Controllers

Helpers

Views

Answer

Correct Answer: Models

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214.
With an XHTML document, how can quirks mode be triggered in Internet Explorer?

Define a doc-type.

Insert a proprietory meta tag into the document head.

Turn it on explicitly with a JavaScript property i.e. window.quirksMode = true.

Answer

Correct Answer: Define a doc-type.

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215.
Which of the following are Rails specific assertions to the test/unit framework?

assert_valid

assert_no_difference

assert_recognizes

assert_send

Answer

Correct Answer: assert_no_difference

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216.
Which of the following options will find a row from the Users table having id = 1?

Users.find(1)

Users.find :first, :conditions => ['id = ?', 1]

Users.find_by_id(1)

Users.with_id_1

Answer

Correct Answer: Users.find(1)

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217. True or False? Proc is a nameless function, an anonymous method.

False

True

Answer

Correct Answer: True

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218. The 'rails c' command...

Returns error, because command does not exist

Starts rails console

Creates a new rails application

Answer

Correct Answer: Starts rails console

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219. How to print the list of available generators?

rails generate

rails generators

rails --generators

rails --list-generators

Answer

Correct Answer: rails generate

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220. After importing from GitHub our Ruby on Rails project via the terminal using "git clone ...", what is required to do to ensure we can start working on our project?

Nothing, git clone does everything for us

Navigate to our project folder, bundle install, rake db:create

Navigate to our project folder, bundle install

Navigate to our project folder, bundle install, rake db:create, rake db:migrate

Navigate to our project folder, rake db:create

Answer

Correct Answer: Navigate to our project folder, bundle install, rake db:create, rake db:migrate

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221. What is the right command to see the list of available tasks?

rake -T or rake --task

rake -t or rake --tasks

rake --all-tasks

rake -T or rake --tasks

rake -L or rake --list

Answer

Correct Answer: rake -T or rake --tasks

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222. Let we have declared a Student class. What is output of this statement? Student.class

null

Uninitialized constant Student

nil

Object

class

Answer

Correct Answer: Object

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223. Which of these statements will utilize the gem named 'mygem

require 'mygem'

instantiate 'mygem'

sudo 'mygem'

Answer

Correct Answer: require 'mygem'

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224. Where to add business logic? a) Model b) Controller c) View

Answer

Correct Answer: a

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225. Where declare validations to a application?

Presenter

Model

Helper

Controller

View

Answer

Correct Answer: Model

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226. If @user is not null, the expression <%= @user.present? ? "Yes" : "No" %> return:

null

nil

Yes

Exception

Answer

Correct Answer: Yes

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227. What is the difference between Post.find(3) and Post.find_by_id(3) ?

find_by will not throw the exception if post with an id=3 will not be found

find_by_id method doesn't even exists in Rails!

there is no difference, "find" is an alias for "find_by_id" method

find_by_id will return collection instead of single record

Answer

Correct Answer: find_by will not throw the exception if post with an id=3 will not be found

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228. a = (1..3).reduce(-6){ |i,x| x + i } puts a

-6

-2

Answer

Correct Answer: 0

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229. [1,2,3,5,8,13].include? '8'

false

true

Answer

Correct Answer: false

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230. The databases supported by ActiveRecord without any other gem are:

Sqlite, MySQL, PostgreSQL, Oracle, MongoDB

Sqlite, MySQL, PostgreSQL, Oracle

Sqlite, PostgreSQL

Sqlite, MySQL, PostgreSQL, MongoDB

Sqlite, MySQL, PostgreSQL

Answer

Correct Answer: Sqlite, MySQL, PostgreSQL

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231. What is the purpose of config.ru file?

It's the file where are defined the gems used

It's the basic Rails configuration file

It's not used in Ruby on Rails applications, it's here only for historic reasons

It's the Rack configuration file, a module webserver interface

Answer

Correct Answer: It's the Rack configuration file, a module webserver interface

Note: This Question is unanswered, help us to find answer for this one

232. The best practice says:

Fat models, thin controllers and views

Fat views, thin models and controllers

Fat controllers, thin models and views

Answer

Correct Answer: Fat models, thin controllers and views

Note: This Question is unanswered, help us to find answer for this one

233. How you can load your database with seeded data

rake db:seed

rake db:seed:data

Answer

Correct Answer: rake db:seed

Note: This Question is unanswered, help us to find answer for this one

234. How to add a coffeescript file, follow the Asset Pipeline rules, somewhere in the "view"?

<%= javascript_include_tag "javascript-file-name" %>

Answer

Correct Answer: <%= javascript_include_tag "javascript-file-name" %>

Note: This Question is unanswered, help us to find answer for this one

235. Where you define the gems used in a Ruby on Rails application?

app/config/Gemfile

config/Gemfile

Gemfile

GEMFILE

Answer

Correct Answer: Gemfile

Note: This Question is unanswered, help us to find answer for this one

236. I already have a project running locally on port 3000. How can I start another project on port 3001?

rails s on 3001

server 3001

rails s -p 3001

rails 3001

rails server -r 3001

Answer

Correct Answer: rails s -p 3001

Note: This Question is unanswered, help us to find answer for this one

237. True or False. Using "rails g scaffold card", this will create a Card controller, model and views.

True

False

Answer

Correct Answer: True

Note: This Question is unanswered, help us to find answer for this one

238. What is the output of following? 1==(0||1)

true

false

Answer

Correct Answer: false

Note: This Question is unanswered, help us to find answer for this one

239. Which of the following is not a standard validates option?

:unique

:confirmation

:exclusion

:presence

Answer

Correct Answer: :unique

Note: This Question is unanswered, help us to find answer for this one

240. The index_by method is...

not a method in standard Ruby on Rails

an ActiveRecord migration helper method for creating database table indexes

a standard ruby method on Array for creating a Hash index from an Array with keys computed by the block argument

an ActiveRecord helper method for fetching results in groups of size specified by the argument

a Ruby on Rails method to create a Hash from an Array with keys computed by the block argument

Answer

Correct Answer: a Ruby on Rails method to create a Hash from an Array with keys computed by the block argument

Note: This Question is unanswered, help us to find answer for this one

241. Which of the following will return true?

all of these

false.class.superclass == Object

true.class == Boolean

true.is_a? Boolean

Answer

Correct Answer: false.class.superclass == Object

Note: This Question is unanswered, help us to find answer for this one

242. Initialize method is always:

private

default

public

protected

Answer

Correct Answer: private

Note: This Question is unanswered, help us to find answer for this one

243. how Date.today differs from Date.current?

with Date.today you’ll have a system date plus Rails’ time zone applied.

with Date.today you’ll have a system date

Answer

Correct Answer: with Date.today you’ll have a system date

Note: This Question is unanswered, help us to find answer for this one

244. What is Strong Parameters in rails 4 ?

This makes Action Controller parameters forbidden to be used in Active Model mass assignment without whitelisted.

It provides an interface for protecting attributes from end-user assignment.

It validates attributes from end-user assignment.

Answer

Correct Answer: It provides an interface for protecting attributes from end-user assignment.

Note: This Question is unanswered, help us to find answer for this one

245. To establish an association from a Post model to another Post model (say if one post is in response to another and there is a parent_post_id column on the posts table), you would add the following to the Post model:

belongs_to :post, :foreign_key => 'parent_post_id'

has_one :parent_post_id, :class_name => 'Post'

has_many :parent_posts, :foreign_key => 'parent_post_id'

has_one :parent_post, :class_name => 'Post'

belongs_to :parent_post, :class_name => 'Post'

Answer

Correct Answer: belongs_to :parent_post, :class_name => 'Post'

Note: This Question is unanswered, help us to find answer for this one

246. What is the output of the following? a = (1 <=> 2) b = (1 <=> 1.0) c = (b <=> a) puts c

FALSE

Answer

Correct Answer: 1

Note: This Question is unanswered, help us to find answer for this one

247. Which of the following is a built-in feature of ActiveRecord

Stored procedures

Writeonly records

Enums

Materialized views

Event triggers

Answer

Correct Answer: Enums

Note: This Question is unanswered, help us to find answer for this one

248. We have given: str = 'abcdef' Which of the following will return the string 'def'? 1) str[0,-3] 2) str[-3,3] 3) str[4,3] 4) str['def']

2 and 4

1 and 2

Answer

Correct Answer: 2 and 4

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249. Which of the following are NOT Ruby keywords? 1) alias 2) yield 3) defined? 4) include?

2 and 3

1 and 2

Answer

Correct Answer: 4

Note: This Question is unanswered, help us to find answer for this one

250. Which of the following will return false?

All of these

(1...5) === 5

123 == 123.0

(1..10) != 1

Answer

Correct Answer: (1...5) === 5

Note: This Question is unanswered, help us to find answer for this one

251. Choose the correct result p a = 1, a = 2

"12"

[1,2]

1 //line break// 2

Answer

Correct Answer: 1 //line break// 2

Note: This Question is unanswered, help us to find answer for this one

252. Which one IS NOT an application server:

Thin

Ebb

Unicorn

Rainbows

Tomahawk

Answer

Correct Answer: Tomahawk

Note: This Question is unanswered, help us to find answer for this one

253. Given the following code: ; module Wheeled; end ; class Vehicle; end ; class Car < Vehicle ; include Wheeled ; end ; What is the value of this expression: Car.new.kind_of? Wheeled

false

no value (raises ArgumentError)

true

nil

Vehicle

Answer

Correct Answer: true

Note: This Question is unanswered, help us to find answer for this one

254. If your controller gets an action that it will render a template for, and you need to add a flash notice to the page, you'd use:

flash.notice(notice_message)

flash[:notice] = notice_message

flash.now.notice(notice_message)

flash.now[:notice] = notice_message

flash = notice_message

Answer

Correct Answer: flash.now[:notice] = notice_message

Note: This Question is unanswered, help us to find answer for this one

255. Output of the following ? person1 = 'Tim' person2 = person1 person1[0] = 'J' puts person1 puts person2

Jim Jim

Tim Tim

Tim Jim

Jim Tim

Answer

Correct Answer: Jim Jim

Note: This Question is unanswered, help us to find answer for this one

256. You've got a form, and when the user submits invalid data, you simply show them an error page (no redirect). In the controller, to show the general error on the rendered page, you would add:

In controller: flash.now[:error] = message

At the top of page: <%= message %>

In controller: flash.now.error = message

In controller: flash.error = message

In controller: flash[:error] = message

Answer

Correct Answer: In controller: flash.now[:error] = message

Note: This Question is unanswered, help us to find answer for this one

257. Counter caches can be used for:

Caching the results of Model.count queries to bypass hitting the database

Saving space in the database by consolidating count query results

Flushing caches when models are modified

Caching arbitrary query results (often of the form Model.count)

Caching the counts of associations to avoid unnecessary Model.count queries

Answer

Correct Answer: Caching the counts of associations to avoid unnecessary Model.count queries

Note: This Question is unanswered, help us to find answer for this one

258. Handling an AJAX request in controller, which of the following redirects to google?

redirect_to 'http://google.com'

All of these

render js: "window.location = 'http://google.com'"

redirect_javascript "http://google.com"

Answer

Correct Answer: render js: "window.location = 'http://google.com'"

Note: This Question is unanswered, help us to find answer for this one

259. If you're using the standard Rails RESTful routes, then which of the following actions map to the url, '/posts'?

posts#create or posts#index

posts#update or posts#index or posts#edit

posts#all or posts#index

posts#destroy_all or posts#index

posts#show or posts#index or posts#create

Answer

Correct Answer: posts#create or posts#index

Note: This Question is unanswered, help us to find answer for this one

260. In development mode (config.assets.digest = false), if a file exists in app/assets/javascript/hello.js, which link will show that file ?

localhost:3000/assets/hello.js

localhost:3000/hello.js

localhost:3000/assets/application.js

localhost:3000/assets/javascript/hello.js

Answer

Correct Answer: localhost:3000/assets/hello.js

Note: This Question is unanswered, help us to find answer for this one

261. Determine the value of the variable a, b and c after the execution of the following code. a, b, c = 1, 2, 3, 4

a = 1 b = [2,3] c = 4

a = 1 b = 2 c = 3

a = 1 b = 2 c = [3, 4]

a = [1, 2] b = 3 c = 4

Answer

Correct Answer: a = 1 b = 2 c = 3

Note: This Question is unanswered, help us to find answer for this one

262. Which is not a valid callback?

before_destroy

after_save

after_delete

before_update

after_validation

Answer

Correct Answer: after_delete

Note: This Question is unanswered, help us to find answer for this one

263. In The Author Model, how do you create a nested association between Authors and Blogs?

has_many :blogs

has_many :blog

:author has_many :blog

:blog has_many :author

has_many :blogs, :through => :author

Answer

Correct Answer: has_many :blogs

Note: This Question is unanswered, help us to find answer for this one

264. What's an equivalent way of performing the following (h is a Hash): h.each { |k,v| h.delete k if k.nil? }

The original will result in a warning: multiple values for a block parameter

h.keys.compact!

h.delete_if { |k,v| k.nil? }

h.compact!

The original will raise a NoMethodError

Answer

Correct Answer: h.delete_if { |k,v| k.nil? }

Note: This Question is unanswered, help us to find answer for this one

265. Which of the following are valid objects of class Integer or one of its subclasses? 1) -123 2) 0xFF 3) 123_456_789 4) 123456789123456789123456789123456789

1 and 4

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

266. If a method is protected:

It may be called by any instance of the defining class or its subclasses

It may be called only by the instance of its subclasses

It may not be called by any instances.

It may be called only by the instance of defining class

Answer

Correct Answer: It may be called by any instance of the defining class or its subclasses

Note: This Question is unanswered, help us to find answer for this one

267. The Controller in Post#create: what is the "best practice" action when the user submits an invalid form?

render action: 'new', alert: 'The Post is incomplete or invalid.'

render action: 'create', alert: 'The Post is incomplete or invalid.'

render action: 'update', alert: 'The Post is incomplete or invalid.'

redirect_to 'new', notice: 'The Post is incomplete or invalid'

redirect_to @post, notice: 'The Post is incomplete or invalid'

Answer

Correct Answer: render action: 'new', alert: 'The Post is incomplete or invalid.'

Note: This Question is unanswered, help us to find answer for this one

268. Which HTTP method is used by default when clicking a button defined using the ActionView helper method 'button_to'?

delete

post

get

put

Answer

Correct Answer: post

Note: This Question is unanswered, help us to find answer for this one

269. What is the ActionView form helper tag for

<%= text_input

<%= input_tag :type=>

<%= text_field_tag

<%= text_tag

Answer

Correct Answer: <%= text_field_tag

Note: This Question is unanswered, help us to find answer for this one

270. Procs are objects, Blocks are not.

true

false

Answer

Correct Answer: true

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271. Which of the following associations does NOT declare a many-to-many relationship?

has_and_belongs_to_many

has_many :through

has_many

Answer

Correct Answer: has_many

Note: This Question is unanswered, help us to find answer for this one

272. If the class User has a belongs_to :role, which table has the foreign key?

User

Neither

Role

Both

Answer

Correct Answer: User

Note: This Question is unanswered, help us to find answer for this one

273. For your app to route the "http://myapp.com/" to the home controller, index action; what could you add to your routes.rb file?

root_to

root =>

root :to =>

root =>

Answer

Correct Answer: root :to =>

Note: This Question is unanswered, help us to find answer for this one

274. What is the best practice to implement translations of the title of a component in the view using i18n API?

I18n.t('title.component')

I18n.t('component.title')

I18n.l('component.title')

I18n.t('title')

Answer

Correct Answer: I18n.t('component.title')

Note: This Question is unanswered, help us to find answer for this one

275. What does Model.reset_column_information do?

Resets all the cached information about columns.

Resets the existing records with the provided value.

Resets the data type of the column.

Resets the column names of the table.

Resets the index of the corresponding table.

Answer

Correct Answer: Resets all the cached information about columns.

Note: This Question is unanswered, help us to find answer for this one

276. What kind of variables are Author and AUTHOR?

constant

local

class

global

Answer

Correct Answer: constant

Note: This Question is unanswered, help us to find answer for this one

277. How do you render a variable in ERB template?

<%= variable_name =>

<% variable_name %>

<%= '#{variable_name}' =%>

<%= "variable_name" =%>

Answer

Correct Answer: <%= variable_name =>

Note: This Question is unanswered, help us to find answer for this one

278. How does the Asset Pipeline (Rails 3.1 +) deal with different precompiled versions of an asset?

Append random 32 character string at precompile

Append version number to filename at precompile

Append datetime to filename at precompile

Append MD5 digest to filename at precompile

Answer

Correct Answer: Append MD5 digest to filename at precompile

Note: This Question is unanswered, help us to find answer for this one

279. What is not a proper REST verb?

post

put

delete

get

update

Answer

Correct Answer: update

Note: This Question is unanswered, help us to find answer for this one

280. What is the proper way to subclass a Module?

module SuperModule << SubModule;

module SuperModule < SubModule; end

You cannot subclass a Module.

module SuperModule << SubModule; end

module SuperModule < SubModule;

Answer

Correct Answer: You cannot subclass a Module.

Note: This Question is unanswered, help us to find answer for this one

281. Which expression will not return a sum of array elements in Ruby on Rails?

None of them. All will return the sum.

sum = 0; array.each { |e| sum += e }; sum

array.inject { |sum, e| sum + e }

array.inject(:+)

array.sum

Answer

Correct Answer: None of them. All will return the sum.

Note: This Question is unanswered, help us to find answer for this one

282. Which column type is NOT supported by Active Record?

datetime

blob

float

decimal

binary

Answer

Correct Answer: blob

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283. Which of these code blocks cannot be right?

= form_for User do |f|

= form_for :user do |f|

= form_for @user do |f|

= form_for current_user do |f|

= simple_form_for @user do |f|

Answer

Correct Answer: = form_for User do |f|

Note: This Question is unanswered, help us to find answer for this one

284. What is the output of the following? $x = 10 puts defined? $X

instance-variable

local-variable

class variable

nil

Answer

Correct Answer: nil

Note: This Question is unanswered, help us to find answer for this one

285. When you've got a form, and when the user submits invalid data, you redirect back to the edit form. If you want to show a general error message (not tied to validation errors) to the user, you'd do which of the following?

In controller: flash.now.error = message

In controller: flash[:error] = message

In controller: flash.error = message

At the top of page: <%= message %>

In controller: flash.now[:error] = message

Answer

Correct Answer: In controller: flash[:error] = message

Note: This Question is unanswered, help us to find answer for this one

286. Which of these is NOT a valid way of associating models?

has_and_belongs_to_many

has_many

has_one

has_and_belongs_to

belongs_to

Answer

Correct Answer: has_and_belongs_to

Note: This Question is unanswered, help us to find answer for this one

287. To randomize the order of entries in an Array, use the _______ method.

shuffle

random

sort

sample

scramble

Answer

Correct Answer: shuffle

Note: This Question is unanswered, help us to find answer for this one

288. What is the output of the following? puts 'a\nb'

a\nb

a/b

a b

anb

Answer

Correct Answer: a\nb

Note: This Question is unanswered, help us to find answer for this one

289. Which of the following controller methods is NOT properly paired with its HTTP counterpart?

CREATE for POST

SHOW for PUT

INDEX for GET

None of these

DESTROY for DELETE

Answer

Correct Answer: SHOW for PUT

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290. What is the main function of helpers used in Ruby on Rails?

Helpers are the functionality provided by the View for the modules to provide the help classes in MVC architecture.

Helpers are the functionality provided by the Controller for the modules to provide the help classes in MVC architecture.

Answer

Correct Answer: Helpers are the functionality provided by the View for the modules to provide the help classes in MVC architecture.

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291. Functional tests are used to test what part of a Rails application?

Controllers

Models

Javascript

Views

Answer

Correct Answer: Controllers

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292. Which of the following is a correctly formatted multi-line comment?

=begin COMMENT =end

/ COMMENT

### COMMENT ###

""" COMMENT """"

/# COMMENT #/

Answer

Correct Answer: =begin COMMENT =end

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293. The session is, by default, accessible to:

models only

controllers and models

controllers and views

models and views

controllers only

Answer

Correct Answer: controllers and views

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294. Does RoR supports multiple inheritance?

false

true

Answer

Correct Answer: false

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295. String objects are _______.

Immutable

Mutable

Neither of these

Answer

Correct Answer: Mutable

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296. A class variable (not class level instance variable) has a name beginning with ___________.

Answer

Correct Answer: @@

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297. Ruby supports single inheritance, multiple inheritance, or both?

It does not support inheritance

Single Inheritance

Multiple Inheritance

Both

Answer

Correct Answer: Single Inheritance

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298. Which is NOT an ActiveRecord migration method?

change_table

add_key

add_index

drop_table

add_column

Answer

Correct Answer: add_key

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299. A correct example of class inheritance from "Exception" into "Bomber"

class Bomber(Exception) def initialize # Instance end end

class Bomber << Exception def initialize # Instance end end

class Bomber < Exception def initialize # Instance end end

Answer

Correct Answer: class Bomber < Exception def initialize # Instance end end

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300. When rendering a partial on a collection, what is the recommended method?

<% @collection.each do |item| %> <%= render :partial => 'partial_to_render', item %> <% end %>

<%= render :partial => 'partial_to_render', :collection => @collection %>

<%= render :partial => 'partial_to_render', :source => @collection.each %>

Answer

Correct Answer: <%= render :partial => 'partial_to_render', :collection => @collection %>

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301. In a Rails migration, what's the syntax for creating a table?

create_table => :table_name

sudo gem install make_table

rake db:create TableName

create_table :table_name

Answer

Correct Answer: create_table :table_name

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302. Ruby 1.9, what new method of building key-value pairs is supported?

Answer

Correct Answer: :

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303. Which of these is not a valid form helper?

radio_button

password_field

text_field

hidden_field

text_box

Answer

Correct Answer: text_box

Note: This Question is unanswered, help us to find answer for this one

304. What is the output of the following? @@x = 10 puts defined? @@x

local-variable

global-variable

instance-variable

class variable

Answer

Correct Answer: class variable

Note: This Question is unanswered, help us to find answer for this one

305. In the context of unit testing Rails applications, "fixture" refers to which of the following?

Predefined data for populating the testing database

The result expected from a passing unit test

Fields which remain fixed across all records in the testing database

The required action to get a unit test to pass

Answer

Correct Answer: Predefined data for populating the testing database

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306. Which does NOT append "nine" to the array: "big_data"?

big_data << "nine"

big_data.append("nine")

big_data.push("nine")

Answer

Correct Answer: big_data.append("nine")

Note: This Question is unanswered, help us to find answer for this one

307. If you want to display the price of an item, with a :time_span tag, where would you place this code?

view or model

model or migration

helper_function or view

migration or helper_function

Answer

Correct Answer: helper_function or view

Note: This Question is unanswered, help us to find answer for this one

308. What is the main step to add ajax call in Ruby on Rails?

:remote :true

remote => true

remote: true

:remote = true

Answer

Correct Answer: remote: true

Note: This Question is unanswered, help us to find answer for this one

309. Which command would generate a DogController with a 'bark' action?

rails g controller Dog bark

rails g c Dog bark

rails create controller Dog bark:action

rails g controller Dog

rails generate Dog:controller bark:action

Answer

Correct Answer: rails g controller Dog bark

Note: This Question is unanswered, help us to find answer for this one

310. Which is an incorrectly defined method?

def method_name() # method operations

def method_name() # method operations end

def method_name # method operations end

Answer

Correct Answer: def method_name() # method operations

Note: This Question is unanswered, help us to find answer for this one

311. Unit tests are used to test what part of a Rails application?

Helpers

Controllers

Models

Views

Answer

Correct Answer: Models

Note: This Question is unanswered, help us to find answer for this one

312. Where do you add named scopes?

Views

ApplicationController

Models

Migrations

Answer

Correct Answer: Models

Note: This Question is unanswered, help us to find answer for this one

313. What is not a RESTful controller action?

update

insert

edit

index

Answer

Correct Answer: insert

Note: This Question is unanswered, help us to find answer for this one

314. What is the output for the following? x = 1==1 ? "a" : "b"; puts x

NameError

false

true

Answer

Correct Answer: a

Note: This Question is unanswered, help us to find answer for this one

315. Which is NOT a reserved Ruby logic flow word?

break

elsif

else

elseif

Answer

Correct Answer: elseif

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316. Of the following, which would create a new project without unit test?

$ rails new example_app --skip-bundle

$ rails new example_app -O

$ rails new example_app --database=postgresql

$ rails new example_app -T

Answer

Correct Answer: $ rails new example_app -T

Note: This Question is unanswered, help us to find answer for this one

317. How would you check to see if an array named COLORS contains the the value 'red'?

COLORS.contains?('red')

COLORS.has?('red')

COLORS.include?('red')

'red'.includedIn?(COLORS)

Answer

Correct Answer: COLORS.include?('red')

Note: This Question is unanswered, help us to find answer for this one

318. Which of these is NOT a default subdirectory of the app/ directory?

All of these are subdirectories of the app/ directory

models

controllers

environments

helpers

Answer

Correct Answer: environments

Note: This Question is unanswered, help us to find answer for this one

319. If you have posts and each post has_many comments, how do you structure your routes?

resources :posts, :comments

resources :posts do resources :comments end

resources :comments do resources :posts end

Answer

Correct Answer: resources :posts do resources :comments end

Note: This Question is unanswered, help us to find answer for this one

320. Which is NOT an ActiveRecord query method?

where

group

has

order

select

Answer

Correct Answer: has

Note: This Question is unanswered, help us to find answer for this one

321. Which of the following will check the array named "big_data" for the presence of a key "icecream"?

big_data.has_key["icecream"]

big_data.has_key?["icecream"]

big_data.has_key?("icecream")

Answer

Correct Answer: big_data.has_key?("icecream")

Note: This Question is unanswered, help us to find answer for this one

322. If you create PostsController, where will Rails look for its templates by default?

app/views/posts

app/views/templates

app/templates

app/views

app/templates/posts

Answer

Correct Answer: app/views/posts

Note: This Question is unanswered, help us to find answer for this one

323. How do you remove a column during a migration?

drop_column :column_name

remove_column :column_name

remove_column :table_name, :column_name

remove_column => :column_name

Answer

Correct Answer: remove_column :table_name, :column_name

Note: This Question is unanswered, help us to find answer for this one

324. Which command, when run, will compile all assets in the 'app/assets' directory and copy compiled versions to a configured target directory ('public/assets' by default)?

rake assets:precompile

rake assets:compileanddeploy

rake assets:compile

rake assets:deploy

Answer

Correct Answer: rake assets:precompile

Note: This Question is unanswered, help us to find answer for this one

325. Which is NOT a Ruby operator?

Answer

Correct Answer: =!

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326. What is the most elegant way to include a javascript file needed for only one page?

Application.layout.Javascripts <<

<%= javascript_include_tag

:render => {:javascript => 'FILE NEEDED'}

Answer

Correct Answer: <%= javascript_include_tag

Note: This Question is unanswered, help us to find answer for this one

327. belongs_to: Represents the inverse of a has_one (or has_many) association.

true

false

Answer

Correct Answer: true

Note: This Question is unanswered, help us to find answer for this one

328. What is the difference between Symbol and String?

symbols, belongs to the category of immutable

string, belongs to the category of immutable

Answer

Correct Answer: symbols, belongs to the category of immutable

Note: This Question is unanswered, help us to find answer for this one

329. If you want the standard restful routes for your person controller, how do you add that?

resources :person do member do post :short end collection do get :long end end

response.map{|person| => :restful}

resources :people

map.person => {:get, :post, :put}

Answer

Correct Answer: resources :people

Note: This Question is unanswered, help us to find answer for this one

330. Where will routes.rb file appear?

app/routes.rb

db/routes.rb

config/routes.rb

app/config/routes.rb

Answer

Correct Answer: config/routes.rb

Note: This Question is unanswered, help us to find answer for this one

331. A module cannot be subclassed or instantiated.

True

False

Answer

Correct Answer: True

Note: This Question is unanswered, help us to find answer for this one

332. Which of the following is a working ruby while-loop?

while i < 100 do # DO THINGS i += 1

while i < 100: # DO THINGS i += 1 end

while i < 100 do # DO THINGS i += 1 end

Answer

Correct Answer: while i < 100 do # DO THINGS i += 1 end

Note: This Question is unanswered, help us to find answer for this one

333. What part of a migration runs during a rollback?

nothing

The entire migration

self.down

self.up

Answer

Correct Answer: self.down

Note: This Question is unanswered, help us to find answer for this one

334. Which is NOT a model validation method?

validates_numericality_of

validates_length_of

validates_form_of

validates_presence_of

validates_uniqueness_of

Answer

Correct Answer: validates_form_of

Note: This Question is unanswered, help us to find answer for this one

335. which one is class method?

class A def a end end

class A def self.a end end

Answer

Correct Answer: class A def self.a end end

Note: This Question is unanswered, help us to find answer for this one

336. If you want to append an item to an array, what is the standard method?

arr.length = arr.length+1 arr[length-1] = item

arr << item

arr.map(item.clone)

arr.append(item)

Answer

Correct Answer: arr << item

Note: This Question is unanswered, help us to find answer for this one

337. Determine the value of the variable x after the execution of the following code. x = [1,2,3] x.pop until x.empty? x.push(4) while x.empty?

[1,2,3]

[4]

[1]

[1,2,3,4]

Answer

Correct Answer: [4]

Note: This Question is unanswered, help us to find answer for this one

338. What file will rails look for given the following erb: <%= render 'some_partial' %>?

+some_partial.html.erb

some_partial.html.erb

@some_partial.html.erb

partial_some_partial.html.erb

_some_partial.html.erb

Answer

Correct Answer: _some_partial.html.erb

Note: This Question is unanswered, help us to find answer for this one

339. Imagine that you have two models: "User" and "Book", and a user can have only one book. How should the association look like in the "User" model?

belongs_to :book

has_many: books

has_one :books

has_one :book

Answer

Correct Answer: has_one :book

Note: This Question is unanswered, help us to find answer for this one

340. What is the use of @ in Ruby?

instance variable

class variable

Answer

Correct Answer: instance variable

Note: This Question is unanswered, help us to find answer for this one

341. Which of these javascript frameworks became the default with the release of Rails 3.1?

rails.js

jQuery

rails-script

Prototype

Answer

Correct Answer: jQuery

Note: This Question is unanswered, help us to find answer for this one

342. What is the use of the 'defined?' method?

To find the value of a variable

To find the memory allocated to that variable

To determine if the variable is defined at the current scope

To find whether it is a constant or variable

Answer

Correct Answer: To determine if the variable is defined at the current scope

Note: This Question is unanswered, help us to find answer for this one

343. If you want the /person url to map to your dog controller and show method, what do you add to your routes?

match '/person', :to => 'dog#show'

map.resources :person

map.resources :dog

map.resources :person => :dog

Answer

Correct Answer: match '/person', :to => 'dog#show'

Note: This Question is unanswered, help us to find answer for this one

344. Which of these does NOT correctly return the version of Ruby?

-VERSION

--version

-v

Answer

Correct Answer: -VERSION

Note: This Question is unanswered, help us to find answer for this one

345. How do you create a new user object with the name david and save it to the database?

User.build(:name => 'david')

User.create(:name => 'david')

User.new(:name => 'david')

User.make(:name => 'david')

Answer

Correct Answer: User.create(:name => 'david')

Note: This Question is unanswered, help us to find answer for this one

346. Which of the following prints the "Hello WORLD!" output with a new line?

puts "Hello WORLD!"

print "Hello WORLD!"

disp( "Hello WORLD!" )

Answer

Correct Answer: puts "Hello WORLD!"

Note: This Question is unanswered, help us to find answer for this one

347. is it possible to change the default port when running a rails server ?

yes

Answer

Correct Answer: yes

Note: This Question is unanswered, help us to find answer for this one

348. What is the default value for a global variable (before initialization)?

null

nil

nul

Answer

Correct Answer: nil

Note: This Question is unanswered, help us to find answer for this one

349. Which files is used to specify any default data that should be loaded into the application's database, when it is first setup?

db/default_data.rb

db/migrate/inital_load.rb

db/migrate/default_data.rb

db/seeds.rb

Answer

Correct Answer: db/seeds.rb

Note: This Question is unanswered, help us to find answer for this one

350. The recommended directory in which to place your app's javascript files is:

app/assets/javascripts

app/javascripts

assets/javascripts

public/javascripts

Answer

Correct Answer: app/assets/javascripts

Note: This Question is unanswered, help us to find answer for this one

351. Which of these is not a standard directory in a Rails application?

lib

app

All of these are standard directories

config

Answer

Correct Answer: All of these are standard directories

Note: This Question is unanswered, help us to find answer for this one

352. What is a typical file extension found in the app/controllers directory

.yml

.erb

.rb

.html.erb

Answer

Correct Answer: .rb

Note: This Question is unanswered, help us to find answer for this one

353. What ORM does Ruby on Rails use by default?

ActiveRails

ActiveSupport

SQL

MySQL

ActiveRecord

Answer

Correct Answer: ActiveRecord

Note: This Question is unanswered, help us to find answer for this one

354. What is the output of the following ? s="foo" * 2 puts s

foo*2

foofoo

Gives an Error

foo

Answer

Correct Answer: foofoo

Note: This Question is unanswered, help us to find answer for this one

355. Which of the following will interpolate within a string with the variable named 'monster'?

"/monster"

"#{monster}"

{monster}

"{monster}"

Answer

Correct Answer: "#{monster}"

Note: This Question is unanswered, help us to find answer for this one

356. What is the preferred method of validating that the name has been set?

validates :name, :presence => true

save!

before_save if name != nil return true end return false end

validates :name => not_null

Answer

Correct Answer: validates :name, :presence => true

Note: This Question is unanswered, help us to find answer for this one

357. Migrations...

generally affect only views and sometimes controllers.

can never be reversed.

back up a project by copying it to another location.

are considered poor programming and are not used significantly in Rails.

modify a database by adding or removing columns or tables.

Answer

Correct Answer: modify a database by adding or removing columns or tables.

Note: This Question is unanswered, help us to find answer for this one

358. What command do you run to update your database?

database_update

rake db:migrate

rails update

rake db:rollback

Answer

Correct Answer: rake db:migrate

Note: This Question is unanswered, help us to find answer for this one

359. Ruby uses:

null

nil

Answer

Correct Answer: nil

Note: This Question is unanswered, help us to find answer for this one

360. How would you declare an Instance Variable?

Answer

Correct Answer: @

Note: This Question is unanswered, help us to find answer for this one

361. What command do you run to drop your database?

rails destroy

rake db:drop

rake db:migrate

database_drop

Answer

Correct Answer: rake db:drop

Note: This Question is unanswered, help us to find answer for this one

362. What command do you run to create your database?

database_create

rake db:migrate

rake db:create

rails create

Answer

Correct Answer: rake db:create

Note: This Question is unanswered, help us to find answer for this one

363. What is the command to install Rails?

gem install ruby_on_rails

gem install ror

gem install rails

Answer

Correct Answer: gem install rails

Note: This Question is unanswered, help us to find answer for this one

364. In the MVC pattern:

MVC are the initials of the creator, Michael Vincent Clantor.

mySQL is the database, vi is the text editor, and C++ is the language.

models represent the data, views display the data, and controllers respond to user interactions

manipulators handle data, validators ensure data integrity, and communicators transfer information between them.

Answer

Correct Answer: models represent the data, views display the data, and controllers respond to user interactions

Note: This Question is unanswered, help us to find answer for this one

365. Which extension is default for views html templates?

.erb

.slim

.rabl

.haml

Answer

Correct Answer: .erb

Note: This Question is unanswered, help us to find answer for this one

366. What is a Gem?

A configuration item

Functionality in a package

Answer

Correct Answer: Functionality in a package

Note: This Question is unanswered, help us to find answer for this one

367. Which is NOT a default Rails environment?

sandbox

test

development

production

Answer

Correct Answer: sandbox

Note: This Question is unanswered, help us to find answer for this one

368. What is the use of @@ in Ruby?

class variable

instance variable

Answer

Correct Answer: class variable

Note: This Question is unanswered, help us to find answer for this one

369. What is the use of $ in Ruby?

$ in Ruby is treated as a class variable

$ in Ruby is treated as a global variable

Answer

Correct Answer: $ in Ruby is treated as a global variable

Note: This Question is unanswered, help us to find answer for this one

370. Which of the following will delete the key-value 1 from array: "big_data"?

big_data.del(1)

big_data.del[1]

big_data.delete(1)

Answer

Correct Answer: big_data.delete(1)

Note: This Question is unanswered, help us to find answer for this one

371. How can you create a new Rails project?

'rails new /path/to/new/app'

'rails /path/to/new/app'

'rails create /path/to/new/app'

Answer

Correct Answer: 'rails new /path/to/new/app'

Note: This Question is unanswered, help us to find answer for this one

372. What gets returned by: [1, [2, 3,[4, 5]]].flatten

[1, 2, 3, 4, 5]

[1, [2, 3, 4, 5]]

[2, 3, [4, 5]]

[1, 2, 3, [4, 5]]

{1: [2, 3, [4, 5]]}

Answer

Correct Answer: [1, 2, 3, 4, 5]

Note: This Question is unanswered, help us to find answer for this one

373. A global variable has a name beginning with:

Answer

Correct Answer: $

Note: This Question is unanswered, help us to find answer for this one

374. What command do you run to undo the last 5 migrations

rake db:rollback STEP=5

database_undo

rake db:drop

rake db:rollback

Answer

Correct Answer: rake db:rollback STEP=5

Note: This Question is unanswered, help us to find answer for this one

Ruby On Rails MCQs | Topic-wise

MCQ on Basic Ruby on Rails

General Ruby On Rails MCQs

Ruby On Rails Subjects

More Resources

Ruby On Rails MCQ

Ruby On Rails Skill Assessment

Ruby On Rails PDF

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Basic Ruby on Rails MCQ

1. Which code sample will skip running the login_required "before" filter on the get_posts controller action?

2. Which choice is an incorrect way to render a partial?

3. Given a table of blog_posts and a related table of comments (comments made on each blog post), which ActiveRecord query will retrieve all blog posts with comments created during @range?

4. Which choice is not a valid Rails route?

5. If User is an ActiveRecord class, which choice would be expected to return an array?

6. Which part of the Rails framework is primarily responsible for making decisions about how to respond to a browser request?

7. Which choice best describes the expected value of @result? @result = Article.first.tags.build(name: 'Urgent')

8. Which statement about ActiveRecord models is true?

9. Review the code below. Which Ruby operator should be used to fill in the blank so that the sort method executes properly? [5,8,2,6,1,3].sort {|v1,v2| v1 ___ v2}

10. In a Rails controller, what does the code params.permit(:name, :sku) do?

11. Which Rails helper would you use in the application view to protect against CSRF (Cross-Site Request Forgery) attacks?

12. When Ruby methods add an exclamation point at the end of their name (such as sort!), what does it typically indicate?

13. What is a popular alternative template language for generating views in a Rails app that is focused on simple abstracted markup?

14. If a model class is named Product, in which database table will ActiveRecord store and retrieve model instances?

15. What is the correct way to generate a ProductsController with an index action using only the command-line tools bundled with Rails?

16. In Rails, what caching stores can be used?

17. If the Rails asset pipeline is being used to serve JavaScript files, how would you include a link to one of those JavaScript files in a view?

18. Where should you put images, JavaScript, and CSS so that they get processed by the asset pipeline?

19. How would you render a view using a different layout in an ERB HTML view?

20. How do you add Ruby code inside Rails views and have its result outputted in the HTML file?

21. In ActiveRecord, what is the difference between the has_many and has_many :through associations?

22. You are using an existing database that has a table named coffee_orders. What would the ActiveRecord model be named in order to use that table?

23. When using an ActiveRecord model, which method will create the model instance in memory and save it to the database?

24. What is the reason for using Concerns in Rails?

25. In Rails, how would you cache a partial template that is rendered?

26. Given the URL helper product_path(@product), which statement would be expected to be false?

27. For a Rails validator, how would you define an error message for the model attribute address with the message "This address is invalid"?

28. How would you generate a drop-down menu that allows the user to select from a collection of product names?

29. When a validation of a field in a Rails model fails, where are the messages for validation errors stored?

30. Are instance variables set within a controller method accessible within a view?

31. Which ActiveRecord query prevents SQL injection?

32. Which choice includes standard REST HTTP verbs?

33. In Rails, which code would you use to define a route that handles both the PUT and PATCH REST HTTP verbs?

34. Which module can you use to encapsulate a cohesive chunk of functionality into a mixin?

35. What is before_action (formerly known as before_filter)?

36. Which statement correctly describes a difference between the form helper methods form_tag and form_for?

37. Within a Rails controller, which code will prevent the parent controller's before_action :get_feature from running?

38. When rendering a partial in a view, how would you pass local variables for rendering?

39. What does the expression x ||= y mean?

40. Which of the following gems is used for authentication in Ruby on Rails? (check any that apply)

41. What is the CGI Library? (check any that apply)

42. The send_data method has the following options? send_data(data, options = {})

44. Which of these files are located by default in "config” directory? (check any that apply)

45. Which of these filters do no exist in Rails controller? (check any that apply)

46. Which of these folders do not exist in folder “app” in Rails 5? (check any that apply)

47. Which of these URL's will not be created by method resources :posts in routes.rb?

48. Which of these statements about Ruby on Rails 5 are false?

49. Why would let() be used in rspec?

50. What is the SQL equivalent of following code? user=User.take(3)

51. Which of the following code snippet can be used to include all javascript files?

52. Which of the following code snippet can be used to include all javascript files?

53. Which following command will you use in Updates Ruby in the latest version?

54. While installing Ruby, why do you sometimes get a missing "psych” error?

55. Which of the following code is correct about Creating links

56. What is the top-level model class added in Ruby on Rails 5?

57. Which type of field is recommended for storing “enum" in Rails?

58. Which of these servers is the default development server for Ruby on Rails 5?

59. Which of these model methods will be generated by this code? enum state: { blocked: 0, active: 1 }

60. Which of these methods catch Exception in Rails controllers?

61. Which of these routes is not generated by “resource :user”?

62. Which of the following open directly is correct about Open URI?

63. Which of these codes will raise an exception? class Person def name 'Andrew' end end # 1. person = Person.new person .name # 2. person = Person.new person. name # 3. Person .new .name # 4. Person .name

64. Which of the following is the correct way to add a field in a signup that is not present in the User Model?

65. Which of these expressions is equivalent to this code? a ||= "string"

66. Which of the following represents the inverse of a has_one association?

67. In order to use optimistic locking, the table needs to have a column called ___________ of type integer.

68. Which character is used to declare a global variable?

69. Which notation is used to create class variables?

70. render method does not accept ________________

71. Which method is used to render partial templates as part of a view?

72. Which of the following types of association is not supported by ActiveRecord?

73. Which helper should be used when your model has association with other models and they also need to be validated?

74. State whether True or False The find method will raise an ActiveRecord::RecordNotFound exception unless a matching record is found for all the supplied primary keys.

75. What is the difference between find() and find_by_id() method?

76. How to disable protection of CSRF attacks for API requests?

77. Which method is used in views to prevent CSRF attack?

78. Which of the following methods can be used inside a controller to prevent CSRF attack?

79. What is the difference between Lambdas and procs?

80. Which file contains the database credentials of an RoR application?

41.
What is the CGI Library? (check any that apply)

42.
The send_data method has the following options? send_data(data, options = {})

44.
Which of these files are located by default in "config” directory? (check any that apply)

45.
Which of these filters do no exist in Rails controller? (check any that apply)

46.
Which of these folders do not exist in folder “app” in Rails 5? (check any that apply)

47.
Which of these URL's will not be created by method resources :posts in routes.rb?

48.
Which of these statements about Ruby on Rails 5 are false?

49.
Why would let() be used in rspec?

50.
What is the SQL equivalent of following code? user=User.take(3)

51.
Which of the following code snippet can be used to include all javascript files?

52.
Which of the following code snippet can be used to include all javascript files?

53.
Which following command will you use in Updates Ruby in the latest version?

54.
While installing Ruby, why do you sometimes get a missing "psych” error?

55.
Which of the following code is correct about Creating links

56.
What is the top-level model class added in Ruby on Rails 5?

57.
Which type of field is recommended for storing “enum" in Rails?

58.
Which of these servers is the default development server for Ruby on Rails 5?

59.
Which of these model methods will be generated by this code? enum state: { blocked: 0, active: 1 }

60.
Which of these methods catch Exception in Rails controllers?

61.
Which of these routes is not generated by “resource :user”?

62.
Which of the following open directly is correct about Open URI?

63.
Which of these codes will raise an exception? class Person def name 'Andrew' end end # 1. person = Person.new person .name # 2. person = Person.new person. name # 3. Person .new .name # 4. Person .name

64.
Which of the following is the correct way to add a field in a signup that is not present in the User Model?

65.
Which of these expressions is equivalent to this code? a ||= "string"

66.
Which of the following represents the inverse of a has_one association?

67.
In order to use optimistic locking, the table needs to have a column called ___________ of type integer.

68.
Which character is used to declare a global variable?

69.
Which notation is used to create class variables?

70.
render method does not accept ________________

71.
Which method is used to render partial templates as part of a view?

72.
Which of the following types of association is not supported by ActiveRecord?

73.
Which helper should be used when your model has association with other models and they also need to be validated?

74.
State whether True or False The find method will raise an ActiveRecord::RecordNotFound exception unless a matching record is found for all the supplied primary keys.

75.
What is the difference between find() and find_by_id() method?

76.
How to disable protection of CSRF attacks for API requests?

77.
Which method is used in views to prevent CSRF attack?

78.
Which of the following methods can be used inside a controller to prevent CSRF attack?

79.
What is the difference between Lambdas and procs?

80.
Which file contains the database credentials of an RoR application?

81.
Which of the following rake commands can be used to load a schema.rb file into the database?

82.
Which file contains the Gem requirements of an RoR App?

83.
Which of the following command is used to list all the routes of an RoR application?

84.
Which of the following is used to achieve multiple inheritance in Ruby?

85.
Which declaration can be used to override the default layout conventions in your controllers?

86.
Which of the following loops is not supported by Ruby?

87.
The belongs_to association supports following options?
A) :autosavename, :class_id
B) :primary_key, :validate, :optional
C) :conuter_cache, :inverse_of, :foreign_key
D) :dependent, :polymorphic, :touch

88.
The has_one association supports following options?

89.
Which of these options for “dependent” do not exist in Rails?

90.
How is it possible to create combined unique index for two fields?

91.
How do you permit nester attributes in Rails controllers for such model? class User has_one :profile accepts_nested_attributes_for :profile end

93.
The following methods skip validations, and will save the object to the database regardless of its validity?

94.
What is the difference between "has_many :through" and "has_and_belongs_to_many"?

95.
What is the purpose of using below code in filter_parameter_logging.rb? Rails.application.config.filter_parameters += [:password]

96.
A controller is a server-side _____ of Rails that responds to external requests from the web server to the application?

97.
In Ruby on Rails, an action is typically a basic ____ that describes how to respond to a specific external web-browser request?

98.
Which of the following instances are variables in your functional tests? (check any that apply)

99.
What are the Available callbacks? (check any that apply)

100.
Which of these is not a valid Bundler command?

101.
What are the asset tag helpers available in Rails? (check any that apply)

102.
The following methods trigger validations, and will save the object to the database only if the object is valid? (check any that apply)

103.
Calls to the render method generally accept using the following options?

104.
What is the lowest version of Ruby supported by Ruby on Rails 5?

105.
Which of the following statements is correct?

106.
Please select the True statements from the following:

107.
Which of the following types of callbacks are available in ROR?

108.
What is the difference between jruby and ruby?

109.
Which of these options is right to create default scope of model in Rails?

110.
Which of these files determine Ruby version and gemset for RVM library?

111.
Which of the following statements is true regarding the find_or_create method in Ruby on Rails?

112.
Which of the following protects "NOT NULL" fields against missing a user input?

113.
Which of the following is not an advantage of using an integrated development environment (IDE) for Rails ,compared with using a simple text editor?

114.
How can the Heroku deprecation warning be removed from a Rails plugin that has been used?

115.
What is TDD is rails3?

116.
Which of these tools are for checking Ruby code styling?

117.
The asset tag helpers do not verify the existence of the assets at the specified locations.

118.
Which of the following validations are supported by models?

119.
After executing the following code, what will the value of foo be? foo = 'bar' wom = Proc.new {|foo| foo = 'baz'} wom.call('pling')

120.

Which of the following will return a User object when used with a model which deals with a table named User?

121.

Which of the following options will correctly show an image in the HTML ERB template in Rails?

122.
Which of the following validations checks if a passed value is an enumeration and falls in the given range?