confirmationを使う場合にRESTfulっぽくなるようにしてみた

routes.rb

resources :products, only: [:index, :show]

namespace :products do
  resources :registrations, only: [:new, :create, :edit, :update]
  resources :confirmations, only: [:show, :update] do
    get :completion, on: :collection
  end
end

namespace :admin do
  resources :products do
    resource :acceptance, only: [:create, :destroy], module: :products
  end
end

# GET    /products
#
# GET    /products/registrations/new
# POST   /products/registrations
# GET    /products/registrations/:id/edit
# PUT    /products/registrations/:id
#
# GET    /products/confirmations/:id
# PUT    /products/confirmations/:id
# GET    /products/confirmations/completion
#
# POST   /admin/products/:product_id/acceptance
# DELETE /admin/products/:product_id/acceptance