Question

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

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.

The class is like this:

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);
        }
    }
}

So how can I access entity manager inside onCommentEvent?

Answer 1

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

Service:

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 }

Listener class:

class CommentListener
{
    protected $mailer;

    protected $entityManager;

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

...

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