if Rails.env.development? ActiveSupport::Dependencies.explicitly_unloadable_constants << "API" api_files = Dir[Rails.root.join('app', 'api', '**', '*.rb')] api_reloader = ActiveSupport::FileUpdateChecker.new(api_files) do Rails.application.reload_routes! end ActionDispatch::Callbacks.to_prepare do api_reloader.execute_if_updated end end