controller

# File actionpack/lib/action_dispatch/routing/mapper.rb, line 872
        def controller(controller, options = {})
          if options.empty?
            begin
              @scope = @scope.new(controller: controller)
              yield
            ensure
              @scope = @scope.parent
            end
          else
            ActiveSupport::Deprecation.warn "#controller with options is deprecated. If you need to pass more options than the controller name use #scope."

            options[:controller] = controller
            scope(options) { yield }
          end
        end