Rails 4.2
Rails 4.2
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ActionDispatch::Routing::Mapper::Scoping

module ActionDispatch::Routing::Mapper::Scoping

You may wish to organize groups of controllers under a namespace. Most commonly, you might group a number of administrative controllers under an admin namespace. You would place these controllers under the app/controllers/admin directory, and you can group them together in your router:

namespace "admin" do
  resources :posts, :comments
end

This will create a number of routes for each of the posts and comments controller. For Admin::PostsController, Rails will create:

GET       /admin/posts
GET       /admin/posts/new
POST      /admin/posts
GET       /admin/posts/1
GET       /admin/posts/1/edit
PATCH/PUT /admin/posts/1
DELETE    /admin/posts/1

If you want to route /posts (without the prefix /admin) to Admin::PostsCon