Nice to have Route concern

routes.rb

BananaPodcast::Application.routes.draw do

  class APIEndPoint
    def self.call(mapper, options)
      mapper.namespace :api, path: '/', constraints: { subdomain: 'api' }
    end
  end

  concern :api, APIEndPoint
  resources :zombies, concerns: :api

  #
  # instead of this:
  #
  # namespace :api, path: '/', constraints: { subdomain: 'api' } do
  #   resources :zombies
  # end
end