routes.md

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TheComments Routes

config/routes.rb

MyApp::Application.routes.draw do
  root 'posts#index'
  resources :posts

  # ...

  # TheComments routes
  concern   :user_comments,  TheComments::UserRoutes.new
  concern   :admin_comments, TheComments::AdminRoutes.new
  resources :comments, concerns:  [:user_comments, :admin_comments]
end

And after that you can see routes:

rake routes | grep comments

 comments        /                         TheComments::Engine
         to_spam_comment POST   /comments/:id/to_spam(.:format)      comments#to_spam
        to_draft_comment POST   /comments/:id/to_draft(.:format)     comments#to_draft
    to_published_comment POST   /comments/:id/to_published(.:format) comments#to_published
      to_deleted_comment DELETE /comments/:id/to_deleted(.:format)   comments#to_deleted
         manage_comments GET    /comments/manage(.:format)           comments#manage
       my_draft_comments GET    /comments/my_draft(.:format)         comments#my_draft
   my_published_comments GET    /comments/my_published(.:format)     comments#my_published
    my_comments_comments GET    /comments/my_comments(.:format)      comments#my_comments
    total_draft_comments GET    /comments/total_draft(.:format)      comments#total_draft
total_published_comments GET    /comments/total_published(.:format)  comments#total_published
  total_deleted_comments GET    /comments/total_deleted(.:format)    comments#total_deleted
     total_spam_comments GET    /comments/total_spam(.:format)       comments#total_spam
          draft_comments GET    /comments/draft(.:format)            comments#draft
      published_comments GET    /comments/published(.:format)        comments#published
        deleted_comments GET    /comments/deleted(.:format)          comments#deleted
           spam_comments GET    /comments/spam(.:format)             comments#spam
                comments GET    /comments(.:format)                  comments#index
                         POST   /comments(.:format)                  comments#create
             new_comment GET    /comments/new(.:format)              comments#new
            edit_comment GET    /comments/:id/edit(.:format)         comments#edit
                 comment GET    /comments/:id(.:format)              comments#show
                         PATCH  /comments/:id(.:format)              comments#update
                         PUT    /comments/:id(.:format)              comments#update
                         DELETE /comments/:id(.:format)              comments#destroy

And now you can use url helpers with 2 ways:

Way 1. Url Helpers

= link_to 'link', comments_path
= link_to 'link', manage_comments_path
= link_to 'link', new_comment_path

= link_to 'link', comment_path(@comment)
= link_to 'link', to_spam_comment_path(@comment)

Way 2. Array notation

= link_to 'link', [:index,  :comments]
= link_to 'link', [:manage, :comments]
= link_to 'link', [:draft,  :comments]

= link_to 'link', [@comment]
= link_to 'link', [:to_spam, @comment]