Flarum\Core\Notification\NotificationSyncer::restore PHP Метод

    public function restore(BlueprintInterface $blueprint)
    {
        Notification::where($this->getAttributes($blueprint))->update(['is_deleted' => false]);
    }

 /**
  * @param PostWasRestored $event
  */
 public function whenPostWasRestored(PostWasRestored $event)
 {
     $this->notifications->restore($this->getNotification($event->post));
 }