Propel ModelType collection

DummyType.php

<?php

namespace Form\Type;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;

class DummyType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('products', 'collection', array(
                'type' => 'model',

                'allow_add' => true,
                'allow_delete' => true,

                'prototype' => true,
                'prototype_name' => 'product___name__',
                'options' => array(
                    'class' => 'Model\Product',
                    'property' => 'name',
                    'label' => 'label.product',
                ),
            ))
        ;
    }

    public function getName()
    {
        return 'dummy';
    }
}