fix sylius form attribute choice.

BuildAttributeFormChoicesListener.php

<?php
namespace BugFix\Sylius\CoreBundle\Form\Type;

use Sylius\Component\Attribute\Model\AttributeTypes;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\Form\FormEvent;
use Symfony\Component\Form\FormEvents;
use Symfony\Component\Form\FormFactoryInterface;

class BuildAttributeFormChoicesListener implements EventSubscriberInterface
{
    /**
     * Form factory.
     *
     * @var FormFactoryInterface
     */
    private $factory;

    /**
     * Constructor.
     *
     * @param FormFactoryInterface $factory
     */
    public function __construct(FormFactoryInterface $factory)
    {
        $this->factory = $factory;
    }

    /**
     * {@inheritdoc}
     */
    public static function getSubscribedEvents()
    {
        return array(
            FormEvents::PRE_SET_DATA => 'buildChoices',
            FormEvents::PRE_SUBMIT => 'addConfiguration',
        );
    }

    public function addConfiguration(FormEvent $event)
    {
        $data = $event->getData();
        $choices = array();

        if (AttributeTypes::CHOICE === $data['type'] && !empty($data['choices'])) {
            foreach($data['choices'] as $choice) {
                $choices[$choice] = $choice;
            }

            $choices = array('choices' => $choices);
        }

        $data['configuration'] = $choices;

        if (!$event->getForm()->has('configuration')) {
            $event->getForm()->add(
                $this->factory->createNamed('configuration', 'collection', null, array(
                    'allow_add'    => true,
                    'allow_delete' => true,
                    'by_reference' => false,
                    'auto_initialize' => false
                ))
            );
        }

        $event->setData($data);
    }

    public function buildChoices(FormEvent $event)
    {
        $attribute = $event->getData();

        if (null === $attribute) {
            return;
        }

        $type = $attribute->getType();

        if (null === $type || AttributeTypes::CHOICE === $type) {
            $data = null;
            $config = $attribute->getConfiguration();

            if (!empty($config['choices'])) {
                $data = $config['choices'];
            }

            $event->getForm()->add(
                $this->factory->createNamed('choices', 'collection', null, array(
                    'type'         => 'text',
                    'allow_add'    => true,
                    'allow_delete' => true,
                    'by_reference' => false,
                    'auto_initialize' => false,
                    'mapped' => false,
                    'data' => $data,
                )
            ));
        }
    }
}