gistfile1.php

<?php

namespace Foo\SiteBundle\Controller;

use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\DependencyInjection\ContainerAwareInterface;

class CmsController implements ContainerAwareInterface
{
    private $container;

    public function setContainer(ContainerInterface $container = null)
    {
        $this->container = $container;
    }

    public function dynamicAction(Request $request)
    {
        if ($request->attributes->has('_entity')) {
            $page = $request->attributes->get('_entity');
            return $this->render($page->getTemplate(), $page);
        }
    }
}