表格Symfony 2.3订阅

Question

I am doing a form with Symfony 2.3 to suscribe to a newsletter. The form is working good in is own template (newsletter.html.twig).

My controller action:

public function newsletterAction(Request $request)
{
    $newsletter = new Newsletter();

    $form = $this->createFormBuilder($newsletter)
        ->add('email', 'email')
        ->add('submit', 'submit')
        ->getForm();

    $form->handleRequest($request);

    if ($form->isValid()) {
        $em = $this->getDoctrine()->getManager();
        $em->persist($newsletter);
        $em->flush();

        $request->getSession()->getFlashBag()->add('notice', 'Vous venez de    vous enregistré à la Newsletter d\'Emoovio.');
    }
    return $this->render('MyBundle:Global:newsletter.html.twig', array(
        'form' => $form->createView(),
    ));
}

My template where it's working (newsletter.html.twig) :

{{ form(form) }}

My template where it does not work (index.html.twig):

////
{% render (controller("EmooviofrontBundle:Global:newsletter")) %}
////

The form is display but it's not working. May be is miss something. Has anyone had the same problem and could explain me. Thank you.