Symfony 2 how to call the renderView method in FormHandler? - symfony-2.4

Question

I try to do a contact form with Symfony 2.4.1. My form is a simple contact one without an entity.
The following error happens in my handler :
FatalErrorException: Error: Call to undefined method Symfony\Component\Form\Form::render() in C:\Program Files\wamp\www\sf2\src\Open\OpcBundle\Form\Handler\ContactHandler.php line 75
And the form handler code :
<?php
// src/Open/OpcBundle/Form/Handler/Handler.php
namespace Open\OpcBundle\Form\Handler;
use Symfony\Component\Form\Form;
use Symfony\Component\HttpFoundation\Request;
class ContactHandler {
protected $request;
protected $form;
protected $mailer;
public function __construct(Form $form, Request $request, $mailer) {
$this->form = $form;
$this->request = $request;
$this->mailer = $mailer;
}
public function process() {
if ('POST' == $this->request->getMethod()) {
$this->form->handleRequest($this->request);
$data = $this->form->getData();
$this->onSuccess($data);
return true;
}
return false;
}
protected function onSuccess($data) {
$message = \Swift_Message::newInstance()
->setContentType('text/html')
->setSubject($data['sujet'])
->setFrom($data['courriel'])
->setTo('me#gmail.com')
->setBody($this->render('OpcOpenBundle:Opc:Mails/contact.html.twig',
array('ip' => $request->getClientIp(),
'nom' => $data['nom'],
'msg' => $data['msg'])
)
);
$this->get('mailer')->send($message);
$request->getSession()->getFlash()->add('success', 'Your email has been sent! Thanks!');
return $this->redirect($this->generateUrl('contact'));
}
}
So the problem is that I don't have an object/instance for the renderView() method to call the template mail with setBody in the function onSuccess()
Which object/instance should I use for ?
Thanks
PS: sorry for my english, i'm French!

Answer 1

It's Symfony\Bundle\TwigBundle\TwigEngine class. service name is 'templating'.
BTW, why is you handler is not service?