routes.rb

TheComments::Engine.routes.draw do
  resources :comments do
    member do
      post   :to_spam
      post   :to_draft
      post   :to_published
      delete :to_deleted
    end

    collection do
      get :manage

      get :my_draft
      get :my_published
      get :my_comments

      get :total_draft
      get :total_published
      get :total_deleted
      get :total_spam

      get :draft
      get :published
      get :deleted
      get :spam
    end
  end
end


App::Application.routes.draw do
  root 'posts#index'
  get "autologin/:id" => "users#autologin",  as: :autologin

  # Login system
  get    "login"    => "sessions#new",     as: :login
  delete "logout"   => "sessions#destroy", as: :logout
  get    "signup"   => "users#new",        as: :signup
  post   "sessions" => "sessions#create",  as: :sessions

  resources :posts

  mount TheComments::Engine => '/'
end


########################

the_comments_engine        /                         TheComments::Engine

Routes for 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


######################


undefined method `comments_path' for #<#<Class:0x9d5c54c>:0x9b67854>