Symfony2 Twig extension: Creating form - forms

Question

I wanted to have a contact-form-block that i can reuse on different pages and templates. So i decided to write a Twig extension. The problem is that i cant access the createFormBuilder() function. The second problem will be then that i cant access the request object for validation. My current code looks like this:
<?php
namespace Name\NameBundle\Controller;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;
class ContactExtension extends \Twig_Extension
{
function getName() {
return 'contact_extension';
}
function getFunctions() {
return array(
'contactform' => new \Twig_Function_Method($this, 'contactform'),
);
}
function contactform() {
$form = $this->createFormBuilder()
->add('Name', 'text')
->add('Message', 'textarea')
->add('Send', 'submit')
->getForm();
return $this->render('NameBundle:forms:contactform.html.twig', array(
'form' => $form->createView(),
}
}
But i get error "Call to undefined method createFormBuilder()"...
Also i will get error if i change the function to function contactform(Request $request) { ... }
What do i need to add to use this function an object? Or maybe the twig extension is the completely wrong approach?

Answer 1

createFormBuilder() is a Controller helper that allows you to access the form.factory service within your controllers through the container (code below)
namespace Symfony\Bundle\FrameworkBundle\Controller;
// ...
class Controller extends ContainerAware
{
// ...
public function createFormBuilder($data = null, array $options = array())
{
return $this->container->get('form.factory')->createBuilder('form', $data, $options);
}
You're not in a "Controller context" here, so if you want to use the form.factory service within your extension you've to inject it.
BUT,
I'll not advice your to manage your contactForm this way (using a Twig Extension function). Why don't you just create a contactAction within the appropriate controller. You can then render your form in your templates using the twig render helper,
{{ render(controller('YourBundle:YourController:contactAction')) }}

Answer 2

If you use Symfony to make your code clear you should make Forms (src/forms) in diffrent file and just call it in your view and controller.