def method_missing(method, *args, &block)
      if main_app_url_helper?(method)
        main_app.send(method, *args)
      else
        super
      end
    end
def method_missing(method, *args, &block)
      if main_app_url_helper?(method)
        main_app.send(method, *args)
      else
        super
      end
    end
Can search for named routes directly in the main app, omitting
 the "main_app." prefix