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

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

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

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

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

Difference between _url and _path while being used in routes?

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

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

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

Which HTML template languages are supported by Ruby?