Singular or plural controller and helper names in Rails

by

Definitely plural.

With restful routing and a singular controller

Controller:

dog_controller.rb

Routes:

map.resources :dogs  # => blows up  
map.resources :dog  # is ok, but...  
dogs_path # => blows up  
dog_path  # => ok

Using a plural controller

Controller:

dogs_controller.rb

Routes:

map.resources :dogs  
dogs_path # => ok  
dog_path # => ok

rails generate controller --help has plural examples:

Example:
`rails generate controller CreditCards open debit credit close`

CreditCards controller with URLs like /credit_cards/debit.
    Controller: app/controllers/credit_cards_controller.rb
    Test:       test/controllers/credit_cards_controller_test.rb
    Views:      app/views/credit_cards/debit.html.erb [...]
    Helper:     app/helpers/credit_cards_helper.rb

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