gistfile1.txt

    public function addCommentAction(Request $request)
    {
        $comment = new Comment();
        $form = $this->createForm(new CommentFormType(),$comment);

        if ($request->isMethod('POST')) {

            $form->handleRequest($request);

            if ($form->isValid()) {

                $project_id = $request->request->get('project_id');
                $project = $this->getDoctrine()
                    ->getRepository('RedmineBundle:Project')
                    ->find($project_id);

                if (!$project) {
                    throw $this->createNotFoundException('Project not found for id '.$project_id);
                }

                $data = $form->getData();
                $data->setUser($this->getUser());
                $data->setProject($project);

                $em = $this->getDoctrine()->getManager();
                $em->persist($data);
                $em->flush();

                $html = $this->renderView('RedmineBundle:Comment:comment.html.twig',array('comment'=>$comment));
                $response = new Response(json_encode(array('html' => $html)));
                $response->headers->set('Content-Type', 'application/json');
                return $response;
            }
        }
    }