Topic.php

<?php

namespace Wj\ForumBundle\Document;

use Doctrine\ODM\PHPCR\Mapping\Annotations as PHPCR;
use Symfony\Component\Validator\Constraints as Assert;

/**
 * @PHPCR\Document(referenceable=true)
 */
class Topic
{
    /**
     * @PHPCR\Id
     */
    private $id;

    /**
     * @PHPCR\NodeName
     * @Assert\NotBlank
     */
    private $title;

    /**
     * @PHPCR\String
     * @Assert\NotBlank
     */
    private $content;

    /**
     * @PHPCR\ParentDocument
     * @Assert\NotNull
     */
    private $category;

    /**
     * @PHPCR\Children
     */
    private $reactions = array();

    public function setTitle($title)
    {
        $this->title = $title;

        return $this;
    }

    public function getTitle()
    {
        return $this->title;
    }

    public function setContent($content)
    {
        $this->content = $content;

        return $this;
    }

    public function getContent()
    {
        return $this->content;
    }

    public function setCategory(Category $category)
    {
        $this->category = $category;

        return $this;
    }

    public function getCategory()
    {
        return $this->category;
    }

    public function addReaction($reaction)
    {
        $reaction->setTopic($this);

        $this->reactions[] = $reaction;
    }

    public function getReactions()
    {
        return $this->reactions;
    }
}

TopicController.php

<?php

namespace Wj\ForumBundle\Controller;

use Wj\ForumBundle\Document\Topic;
use Symfony\Bundle\FrameworkBundle\Templating\EngineInterface;
use Symfony\Component\Form\FormFactoryInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpFoundation\Session\Session;
use Doctrine\Bundle\PHPCRBundle\ManagerRegistry;

class TopicController
{
    protected $templating;
    protected $formFactory;
    protected $doctrinePhpcr;
    protected $session;

    public function __construct(EngineInterface $templating, FormFactoryInterface $formFactory, ManagerRegistry $doctrinePhpcr, Session $session)
    {
        $this->templating = $templating;
        $this->formFactory = $formFactory;
        $this->doctrinePhpcr = $doctrinePhpcr;
        $this->session = $session;
    }
    
    public function createAction(Request $request)
    {
        $topic = new Topic();

        $form = $this->formFactory->createBuilder('form', $topic)
            ->add('title', 'text')
            ->add('category', 'phpcr_document', array(
                'class' => 'WjForumBundle:Category',
            ))
            ->add('content', 'textarea')
            ->add('submit', 'submit')
            ->getForm();

        $form->handleRequest($request);

        if ($form->isValid()) {
            $dm = $this->doctrinePhpcr->getManager();

            $dm->persist($topic);

            $dm->flush();

            $this->session->getFlashBag()->add('notice', sprintf('Topic "%s" is created', $topic->getTitle()));

            return new RedirectResponse('/topic/create/success');
        }

        return $this->templating->renderResponse('WjForumBundle:Topic:create.html.twig', array(
            'form' => $form->createView(),
        ));
    }

    public function createSuccessAction()
    {
        return $this->templating->renderResponse('WjForumBundle:Topic:create_success.html.twig', array(
            'message' => current($this->session->getFlashBag()->get('notice')),
        ));
    }
}