gistfile1.php

<?php

namespace Wj\ForumBundle\Document;

use Doctrine\ODM\PHPCR\Mapping\Annotations as PHPCR;
use Symfony\Cmf\Component\Routing\RouteReferrersReadInterface;

/**
 * @PHPCR\Document(referenceable=true)
 */
class Topic implements RouteReferrersReadInterface
{
    // ...

    /**
     * @PHPCR\Referrers(
     *     referringDocument="Symfony\Cmf\Bundle\RoutingBundle\Doctrine\Phpcr\Route",
     *     referencedBy="content"
     * )
     */
    protected $routes;

    // ...

    public function getRoutes()
    {
        return $this->routes;
    }
}