Symfony Event Listener to Increase Post View Count

PostController.php

<?php

/**
 * Created by PhpStorm.
 * User: bhaktaraz
 * Date: 8/24/15
 * Time: 9:51 AM
 */

namespace BRB\Bundle\PostBundle\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\Controller;

class PostController extends Controller
{
    public function viewAction()
    {
        $event = new PostEvent($post);
        $dispatcher = $this->get('event_dispatcher');
        $dispatcher->dispatch(
            PostEvents::POST_VIEWED,
            $event
        );
    }
}

PostEvent.php

<?php

/**
 * Created by PhpStorm.
 * User: bhaktaraz
 * Date: 11/16/15
 * Time: 11:14 AM
 */

namespace BRB\Bundle\ApiBundle\Event;

use BRB\Bundle\PostBundle\Entity\Post;
use Symfony\Component\EventDispatcher\Event;

class PostEvent extends Event
{
    protected $post;

    public function __construct(Post $post)
    {
        $this->post = $post;
    }

    public function getPost()
    {
        return $this->post;
    }
}

PostEvents.php

<?php

/**
 * Created by PhpStorm.
 * User: bhaktaraz
 * Date: 11/16/15
 * Time: 11:14 AM
 */

namespace BRB\Bundle\ApiBundle\Event;

final class PostEvents
{
    const POST_VIEWED = 'post.viewed';
}

PostListener.php

<?php

/**
 * Created by PhpStorm.
 * User: bhaktaraz
 * Date: 11/16/15
 * Time: 11:23 AM
 */

namespace BRB\Bundle\ApiBundle\Listener;

use BRB\Bundle\ApiBundle\Event\PostEvent;
use Doctrine\ORM\EntityManager;

class PostListener
{
     /**
     *
     * @var EntityManager 
     */
    protected $em;

    public function __construct(EntityManager $entityManager) 
    {
      $this->em = $entityManager;
    }

    public function onPostViewed(PostEvent $event)
    {
        $post = $event->getPost();
        
        $post->increaseViewCount(); // This method shoud be in your Post entity
        
        $this->em->persist($post);
        $this->em->flush();
    }
}

services.yml

services:
    post_bundle.listener.post:
        class: BRB\Bundle\ApiBundle\Listener\PostListener
        arguments: [ "@doctrine.orm.entity_manager" ]
        tags:
            - { name: kernel.event_listener, event: post.viewed, method: onPostViewed }