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

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

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

Difference between _url and _path while being used in routes?

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

Which 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

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

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?

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

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

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