controller_reference

# File actionpack/lib/action_dispatch/routing/route_set.rb, line 54
        def controller_reference(controller_param)
          controller_name = "#{controller_param.camelize}Controller"

          unless controller = @controllers[controller_param]
            controller = @controllers[controller_param] =
              ActiveSupport::Dependencies.reference(controller_name)
          end
          controller.get(controller_name)
        end