RailsのRoutingあれこれ

case1.rb

Rails.application.routes.draw do
  resources :users do
    get '/image' => 'users#image', as: :image
  end
end

=begin
user_image GET    /users/:user_id/image(.:format) users#image
     users GET    /users(.:format)                users#index
           POST   /users(.:format)                users#create
  new_user GET    /users/new(.:format)            users#new
 edit_user GET    /users/:id/edit(.:format)       users#edit
      user GET    /users/:id(.:format)            users#show
           PATCH  /users/:id(.:format)            users#update
           PUT    /users/:id(.:format)            users#update
           DELETE /users/:id(.:format)            users#destroy
=end

case2.rb

Rails.application.routes.draw do
  resources :users
  get '/users/:id/image' => 'users#image', as: :user_image
end

=begin
     users GET    /users(.:format)           users#index
           POST   /users(.:format)           users#create
  new_user GET    /users/new(.:format)       users#new
 edit_user GET    /users/:id/edit(.:format)  users#edit
      user GET    /users/:id(.:format)       users#show
           PATCH  /users/:id(.:format)       users#update
           PUT    /users/:id(.:format)       users#update
           DELETE /users/:id(.:format)       users#destroy
user_image GET    /users/:id/image(.:format) users#image
=end

case3.rb

Rails.application.routes.draw do
  resources :users do
    get '/image' => 'users#image', as: :image, on: :member
  end
end

=begin
image_user GET    /users/:id/image(.:format) users#image
     users GET    /users(.:format)           users#index
           POST   /users(.:format)           users#create
  new_user GET    /users/new(.:format)       users#new
 edit_user GET    /users/:id/edit(.:format)  users#edit
      user GET    /users/:id(.:format)       users#show
           PATCH  /users/:id(.:format)       users#update
           PUT    /users/:id(.:format)       users#update
           DELETE /users/:id(.:format)       users#destroy
=end