routing_concerns

📦 Use Routing Concerns for DRY Routes

Routing concerns let you extract reusable sets of routes to keep your routes.rb clean and DRY. This is especially helpful when multiple resources share the same nested routes or actions.

# config/routes.rb
concern :commentable do
  resources :comments, only: [:index, :create, :destroy]
end

Rails.application.routes.draw do
  resources :posts, concerns: :commentable
  resources :photos, concerns: :commentable
end

Here, both posts and photos get identical comments routes without duplication. You can also pass options to concerns or even nest concerns within other resources.