路由关注和多态模型：如何共享控制器和视图？

Given the routes:

鉴于路线：

Example::Application.routes.draw do
  concern :commentable do
    resources :comments
  end

  resources :articles, concerns: :commentable

  resources :forums do
    resources :forum_topics, concerns: :commentable
  end
end
Example::Applicatio