Counter caches can be used for:

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:

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

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:

Given 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

Which one IS NOT an application server:

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

Which option will correctly show an image in the HTML ERB template in Rails?

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

Which will change a Rails 3 app to run in production mode?

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?