Rails routing for nested resources with :as parameter

1st

    api_post_comments GET    /api/posts/:post_id/comments(.:format)          comments#index
                      POST   /api/posts/:post_id/comments(.:format)          comments#create
 new_api_post_comment GET    /api/posts/:post_id/comments/new(.:format)      comments#new
edit_api_post_comment GET    /api/posts/:post_id/comments/:id/edit(.:format) comments#edit
     api_post_comment GET    /api/posts/:post_id/comments/:id(.:format)      comments#show
                      PUT    /api/posts/:post_id/comments/:id(.:format)      comments#update
                      DELETE /api/posts/:post_id/comments/:id(.:format)      comments#destroy
            api_posts GET    /api/posts(.:format)                            posts#index
                      POST   /api/posts(.:format)                            posts#create
         new_api_post GET    /api/posts/new(.:format)                        posts#new
        edit_api_post GET    /api/posts/:id/edit(.:format)                   posts#edit
             api_post GET    /api/posts/:id(.:format)                        posts#show
                      PUT    /api/posts/:id(.:format)                        posts#update
                      DELETE /api/posts/:id(.:format)                        posts#destroy

2nd

    api_post_comments GET    /api/posts/:api_post_id/comments(.:format)          comments#index
                      POST   /api/posts/:api_post_id/comments(.:format)          comments#create
 new_api_post_comment GET    /api/posts/:api_post_id/comments/new(.:format)      comments#new
edit_api_post_comment GET    /api/posts/:api_post_id/comments/:id/edit(.:format) comments#edit
     api_post_comment GET    /api/posts/:api_post_id/comments/:id(.:format)      comments#show
                      PUT    /api/posts/:api_post_id/comments/:id(.:format)      comments#update
                      DELETE /api/posts/:api_post_id/comments/:id(.:format)      comments#destroy
            api_posts GET    /api/posts(.:format)                                posts#index
                      POST   /api/posts(.:format)                                posts#create
         new_api_post GET    /api/posts/new(.:format)                            posts#new
        edit_api_post GET    /api/posts/:id/edit(.:format)                       posts#edit
             api_post GET    /api/posts/:id(.:format)                            posts#show
                      PUT    /api/posts/:id(.:format)                            posts#update
                      DELETE /api/posts/:id(.:format)                            posts#destroy

routes.rb

Blog::Application.routes.draw do
  # 1st variant
  scope "/api", :as => 'api' do
    resources :posts do
      resources :comments
    end
  end

  # 2nd variant
  scope "/api" do
    resources :posts, :as => 'api_posts' do
      resources :comments
    end
  end
end