class ShippingItemTypeExtension 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) {
            $form = $event->getForm();
            $Shippings = $form['shippings'];
        });
    }

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