rails: routes concerns

routes_concerns.rb

# examples of rails 4 routes concerns
concern :commentable do
  resources :comments
end
 
concern :image_attachable do
  resources :images, only: :index
end
 
resources :messages, concerns: :commentable
 
resources :posts, concerns: [:commentable, :image_attachable]

concern :printable do
  member do
    post :print
  end
end

resources :pamphlets, concerns: :printable

resources :posters, concerns: :printable do
  collection do
    post :bulk_print
  end
end