Symfony2 Twig extension: Creating form

forms, symfony, twig

Solution

`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')) }}

Problem

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?

Original source