Article.php

<?php
namespace Acme\ContentBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Acme\BaseBundle\Annotations\RDF as RDF;

/**
 * Acme\ContentBundle\Entity\Article
 *
 * @RDF\Type(name="http://schema.org/Article")
 * @ORM\Table()
 * @ORM\Entity(repositoryClass="Acme\ContentBundle\Entity\ArticleRepository")
 */
class Article
{
    /**
     * @var string $title
     *
     * @RDF\Property(name="http://schema.org/headline")
     * @ORM\Column(name="title", type="string", length=255)
     */
    private $title;

    /**
     * @var text $introText
     *
     * @RDF\Property(name="http://schema.org/alternativeHeadline")
     * @ORM\Column(name="introText", type="text")
     */
    private $introText;

    /**
     * @var text $mainText
     *
     * @RDF\Property(name="http://schema.org/text")
     * @ORM\Column(name="mainText", type="text")
     */
    private $mainText;

    /**
     * @var datetime $publishDate
     *
     * @RDF\Property(name="http://schema.org/datePublished")
     * @ORM\Column(name="publishDate", type="datetime")
     */
    private $publishDate;
}

ArticleController.php

<?php

namespace Acme\ContentBundle\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpKernel\Exception\HttpException;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Template;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Method;

class ArticleController extends Controller
{
    /**
     * @Route("/article/{slug}", name="content.article.show")
     * @Method({"GET"})
     * @Template()
     */
    public function showAction($slug)
    {
        $article = $this->getDoctrine()->getRepository('\Acme\ContentBundle\Entity\Article')
            ->findOneBySlug($slug);

        return array('article' => $article, 'canEdit'=> true);
    }



    /**
     * @Route("/article/{slug}", name="content.article.update")
     * @Method({"PUT"})
     */
    public function updateAction($slug)
    {
        $article = $$this->getDoctrine()->getRepository('\Acme\ContentBundle\Entity\Article')->findOneBySlug($slug);

        $json = $this->getRequest()->getContent();
        $obj = json_decode($json, true);

        try {
            $entityTranslator = new \Acme\BaseBundle\Annotations\RDF\Helper\RDFEntityTranslator($article);
            $entityTranslator->applyData($obj);

            /** @var $router \Symfony\Component\Routing\Router */
            $router = $this->get('router');
            $uri = $router->generate('content.article.show', array('slug' => $article->getSlug()), true);

            $jsonLd = $entityTranslator->getJsonLdObject( $uri );

            $manager = $this->getDoctrine()->getManagerForClass(get_class($article));
            $manager->persist($article);
            $manager->flush();

            return new \Symfony\Component\HttpFoundation\JsonResponse($jsonLd);
        } catch( \Exception $e ) {
            echo $e->getMessage();
            exit;
        }
    }
}