komagataのブログ

Railsで綺麗なURLにしたいと思うと一つのControllerに機能が集中して困ることがあります。

/comments
/posts/1/comments
/users/1/comments

# config/routes.rb:
Foo::Application.routes.draw do
  resources :comments
  resources :posts do
    resources :comments
  end
  resources :users do
    resources :comments
  end
end

例えばこんな風にしたい時。

# app/controllers/comments_controller.rb:
class CommentsController < ApplicationController
  def index
    @comments =
      if params[:post_id]
        Post.find(params[:post_id]).comments
      elsif params[:user_id]
        User.find(params[:user_id]).comments
      else
        Comment.all
      end
  end
end

こんな風に書く？えーキモーイ。そもそもそれぞれの場合でviewが全然違うんですけどーみたいな場合。

そんなんねぇ俺の糞みたいな悩みはねぇStack Overflowさんに聞けば一発なんですよ。

Rails Namespace vs. Nested Resource - Stack Overflow

controllerのnamespaceでスッキリ書けるみたいです。

/comments
/posts/1/comments
/users/1/comments

# config/routes.rb:
Foo::Application.routes.draw do
  resources :comments
  resources :posts do
    resources :comments, controller: 'posts/comments'
  end
  resources :users do
    resources :comments, controller: 'users/comments'
  end
end

# app/controllers/comments_controller.rb:
class CommentsController < ApplicationController
  def index
    @comments = Comment.all
  end
end

# app/controllers/posts/comments_controller.rb:
class Posts::CommentsController < ApplicationController
  def index
    @comments = Post.find(params[:post_id]).comments
  end
end

# app/controllers/users/comments_controller.rb:
class Users::CommentsController < ApplicationController
  def index
    @comments = User.find(params[:user_id]).comments
  end
end

$ rake routes
(snip)
comments GET    /comments(.:format)                       comments#inde
post_comments GET    /posts/:post_id/comments(.:format)     posts/comments#index
user_comments GET    /users/:user_id/comments(.:format)     users/comments#index
(snip)

おおお、これはスッキリ！

Stack Overflow脳の恐怖。