public function onGetCurrentUserGuid($event)
    {
        $sender = $event->sender;
        /* @var $sender static */
        if (isset($sender->attributes[$sender->createdByAttribute])) {
            return $sender->attributes[$sender->createdByAttribute];
        }
        $identity = \Yii::$app->user->identity;
        /* @var $identity BaseUserModel */
        if ($identity) {
            return $identity->getGUID();
        }
    }