sample-factory.php

<?php

namespace Sensio\HelloBundle;

use Symfony\Component\Form\FormFactory;
use Sensio\HelloBundle\Entity\Post;
use Sensio\HelloBundle\Entity\Comment;

class HelloFormFactory
{
    private $factory;

    public function __construct(FormFactory $factory)
    {
        $this->factory = $factory;
    }

    public function getPostForm(Post $post = null, $name = 'post')
    {
        $factory = $this->factory;

        return $factory->getForm('post')
            ->setDataClass('Sensio\HelloBundle\Entity\Post')
            ->setData($post)
            ->add('title')
            ->add('content')
            ->add('abstract')
            ->add($factory->getCheckboxField('enabled'))
            ->add($factory->getDateField('publicationDateStart'))
            ->add($factory->getChoiceField('commentsDefaultStatus', array(
                'choices' => Comment::getStatusCodes(),
            )))
            ->add($factory->getEntityChoiceField('tags', array(
                'class' => 'Sensio\HelloBundle\Entity\Tag',
                'expanded' => true,
                'multiple' => true,
            )));
    }
}