src/PHPDish/Bundle/CoreBundle/EventListener/Notification/PostSubscriber.php
public function onCategoryFollowed(CategoryFollowedEvent $event)
    {
        if ($event->getCategory()->getCreator() === $event->getFollower()) {
            return;
        }
        $this->notificationHelper->createFollowCategoryNotification($event->getCategory(), $event->getFollower());
    }
public function onCategoryFollowed(CategoryFollowedEvent $event)
    {
        if ($event->getCategory()->getCreator() === $event->getFollower()) {
            return;
        }
        $this->notificationHelper->createFollowCategoryNotification($event->getCategory(), $event->getFollower());
    }
专栏被关注时给专栏创建者发消息.

@param CategoryFollowedEvent $event