code: public function performAction($actionName) {
          if (method_exists($this, $actionName)) {
              return $this->$actionName();
          } else {
              return cmfJsonResponse(HttpCode::NOT_FOUND)
                  ->setMessage('Method [' . static::class . '->' . $actionName . '] is not defined');
          }
      }
docs: Call scaffold's method called $actionName without arguments
  @param string $actionName
  @return $this