$app['eccube.event.dispatcher']->dispatch(EccubeEvents::FRONT_SHOPPING_INDEX_INITIALIZE, $event);
$form = $builder->getForm();
$Shippings = $form->get('shippings')->getData();
if (!empty($Shippings)) {
    foreach ($Shippings as $key => $Shipping) {
        $Delivery = $Shipping->getDelivery();
        if ($Delivery) {
            $options = $Delivery->getConfig()->getOptions();
            $choices = $options['choices'];
            $choice_list = $options['choice_list']->getValues();
            var_dump($choice_list);
        }
    }
}

class ShoppingTypeExtension extends AbstractTypeExtension
{
    public $app;

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

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $app = $this->app;
        if ($app->isGranted('ROLE_ADMIN')) {
            return;
        }

        $builder->addEventListener(FormEvents::POST_SET_DATA, function (FormEvent $event) use ($app) {
            $delivery_id = null;
            $form = $event->getForm();
            $Shippings = $form->get('shippings');
            if (!empty($Shippings)) {
                foreach ($Shippings as $key => $Shipping) {
                    $deliveries = null;
                    $Shipping->remove('delivery');
                    $Shipping
                        ->add('delivery', 'entity', array(
                            'class' => 'Eccube\Entity\Delivery',
                            'property' => 'name',
                            'choices' => $deliveries,
    //                        'data' => $delivery,
                            'constraints' => array(
                                new Assert\NotBlank(),
                            ),
                        ));
                }
            }
        });
    }

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
    }

    public function getExtendedType()
    {
        return 'shopping';
    }
}