[LeonidBugaev]

I'll be frank, the latest Rails version I used was Rails 3, and it was like 6 years ago, so I can't really remember details, except that I had to spread logic to like 3 files to make it work. Maybe things changed.

[yxhuvud]

No, you didn't have to spread out the logic like that in Rails3. You could do something like

    class AsController < ApplicationController
      def index
      end

      class BsController < ApplicationController
        def create
        end
      end
    end

with routes like

     resources :as do
       resources :bs, controller: "as/bs", only: :create
     end

[ryanbrunner]

Even that is resourceful routing, just with nested resources. Doing a flat out custom route is even easier:

    class AsController < ApplicationController
      def custom
      end
    end

routes:

    resources :as do
      member { get :custom }
    end

[yxhuvud]

Yes, of course.

The whole point of my example was that it is possible to do resourceful routing in a single file without having to resort to using custom routes. I try to avoid custom routes whenever possible - in my experience they lead to pain in the long run, more often than not.