Symfony2 Propel API response

AbstractController.php

<?php

namespace Sternenbund\Bundle\ApplicationBundle\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\Controller as BaseController;

use PropelObjectCollection;

abstract class AbstractController extends BaseController
{
    // even more little helpers

    /**
     * Returns a JSON Response.
     *
     * @param array $parameters
     * @param Response|null $response
     *
     * @return Response
     */
    public function renderJson(array $parameters = array(), Response $response = null)
    {
        return $this->render('::base.json.twig', $parameters, $response);
    }

    /**
     * Returns a JSON Response containing the collection entries as data.
     *
     * @param PropelObjectCollection $coll
     * @param Response|null $response
     *
     * @return Response
     */
    public function renderJsonCollection(PropelObjectCollection $coll, Response $response = null)
    {
        return $this->renderJson(array('data' => $coll->toArray(null, false, \BasePeer::TYPE_FIELDNAME)), $response);
    }
}

base.json.twig

{% set jsonp = app.request.query.get('jsonp') %}
{% if jsonp %}{{ jsonp }}({% endif %}
{% block data %}{% if is_json|default(false) %}{{ data|raw }}{% else %}{{ data|json_encode|raw }}{% endif %}{% endblock %}
{% if jsonp %});{% endif %}

HullController.php

<?php

namespace Sternenbund\Bundle\ShipdevBundle\Controller;

use Sternenbund\Bundle\ApplicationBundle\Controller\AbstractController;

use Sternenbund\Bundle\ShipdevBundle\Form\Type\HullType;
use Sternenbund\Bundle\ShipdevBundle\Model\Hull\Hull;
use Sternenbund\Bundle\ShipdevBundle\Model\Hull\HullPeer;
use Sternenbund\Bundle\ShipdevBundle\Model\Hull\HullQuery;
use Sternenbund\Bundle\ShipdevBundle\Model\Shipdev\Set;

use Symfony\Component\Form\FormError;

use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;

class HullController extends AbstractController
{
    // more actions ...

    public function listAction(Set $set = null)
    {
        $query = HullQuery::create();

        if ($set) {
            $query->filterBySet($set);
        }

        /* @var $hulls \PropelObjectCollection */
        $hulls = $query
            ->orderByOrder()
            ->addAscendingOrderByColumn(HullPeer::NAME)
            ->find()
        ;

        if ('json' === $this->getRequest()->getRequestFormat()) {
            return $this->renderJsonCollection($hulls);
        }

        return $this->render('ShipdevBundle:Hull:list.html.twig', array(
            'hulls' => $hulls,
        ));
    }
}

routing.yml

shipdev_hull_list:
    pattern: /hulls/{id}.{_format}
    defaults: { _controller: ShipdevBundle:Hull:list }
    requirements:
        id: \d+
        _method: GET
        _format: json|html

Example response, Backbone.JS compatible :)

[
    {
        "id": 1,
        "name": "Korvette",
        "set_id": 1,
        "order": 1,
        "min_level": 1,
        "max_level": 5
    },
    {
        "id": 2,
        "name": "Fregatte",
        "set_id": 1,
        "order": 2,
        "min_level": 2,
        "max_level": 33
    },
    {
        "id": 3,
        "name": "Frachter",
        "set_id": 1,
        "order": 3,
        "min_level": 3,
        "max_level": 123
    },
    {
        "id": 4,
        "name": "Tankschiff",
        "set_id": 1,
        "order": 4,
        "min_level": 5,
        "max_level": 126
    },
    {
        "id": 5,
        "name": "Versorgungsschiff",
        "set_id": 1,
        "order": 5,
        "min_level": 7,
        "max_level": 121
    },
    {
        "id": 6,
        "name": "Zerstörer",
        "set_id": 1,
        "order": 6,
        "min_level": 8,
        "max_level": 55
    },
    {
        "id": 7,
        "name": "Transportschiff",
        "set_id": 1,
        "order": 7,
        "min_level": 12,
        "max_level": 121
    },
    {
        "id": 8,
        "name": "Begleitschiff",
        "set_id": 1,
        "order": 8,
        "min_level": 13,
        "max_level": 121
    },
    {
        "id": 9,
        "name": "Kommandoschiff",
        "set_id": 1,
        "order": 9,
        "min_level": 14,
        "max_level": 121
    },
    {
        "id": 10,
        "name": "Waffenplattform",
        "set_id": 1,
        "order": 10,
        "min_level": 21,
        "max_level": 50
    },
    {
        "id": 11,
        "name": "Kreuzer",
        "set_id": 1,
        "order": 11,
        "min_level": 50,
        "max_level": 61
    },
    {
        "id": 12,
        "name": "Gefechtsstation",
        "set_id": 1,
        "order": 12,
        "min_level": 75,
        "max_level": 71
    },
    {
        "id": 13,
        "name": "Schlachtkreuzer",
        "set_id": 1,
        "order": 13,
        "min_level": 80,
        "max_level": 82
    }
]