如果我在symfony2中创建自定义事件，我如何访问实体管理器 [英] How can i access entity manager if i create custom event in symfony2

问题描述

我已经创建了自定义事件，就像当用户被分类时，事件调度员将触发该事件。

I have created custom event like when user is generataed then Event dispatcher will fire that event.

我正在关注本教程。我想知道在他的 class CommentListener 中，我如何访问实体管理器，因为我想在数据库中保留很少的东西。

I am following this tutorial. I want to know that in his class CommentListener how can I access the entity manager because I want to persist few things in the database.

类是这样的：

class CommentListener
{
    protected $mailer;

    public function __construct(Swift_Mailer $mailer)
    {
        $this->mailer = $mailer;
    }

    public function onCommentEvent(CommentEvent $event)
    {
        $post = $event->getPost();
        $comment = $event->getComment();

        foreach ($post->getSubscribers() as $subscriber) {
            $message = Swift_Message::newInstance()
                ->setSubject('New comment posted on ' . $post->getTitle())
                ->setFrom('[e-mail]')
                ->setTo($subscriber->getEmail())
                ->setBody("Hey, somebody left a new comment on a post you're subscribed to! It says: " . $comment->getBody())
            ;
            $this->mailer->send($message);
        }
    }
}

那么如何访问实体经理在 onCommentEvent ？

So how can I access entity manager inside onCommentEvent?

推荐答案

听众是正常的服务。您可以将其注入构造函数以及 mailer 。以下这些行：

Listeners are normal services. You can just inject it into constructor along with mailer. Something along these lines:

服务：

services:
    foo_bundle.listener.comment:
        class: FooVendorBarBundleEventListenerCommentListener
        arguments:
            mailer: "@mailer"
            entityManager: "@doctrine.orm.entity_manager"
        tags:
            - { name: kernel.event_listener, event: foo_bundle.post.comment_added, method: onCommentEvent }

听众类：

class CommentListener
{
    protected $mailer;

    protected $entityManager;

    public function __construct(Swift_Mailer $mailer, $entityManager)
    {
        $this->mailer = $mailer;
        $this->entityManager = $entityManager;
    }

...

如果您需要找出某些服务的名称运行 php app / console container：debug 。

If you ever need to find out name of certain service run php app/console container:debug.

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