Symfony - Embedded集合表单有条件验证

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\CollectionType;
use Symfony\Component\Form\FormBuilderInterface;

class OrderFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('orderItems', CollectionType::class, [
                'entry_type' => OrderItemFormType::class,
                'allow_add' => true,
                'allow_delete' => true,
                'by_reference' => false,
            ]);
    }
}

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\Extension\Core\Type\IntegerType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\Validator\Constraints\NotBlank;
use Symfony\Component\Validator\Constraints\Type;

class OrderItemFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('productName', TextType::class, [
                'constraints' => [
                    new NotBlank(),
                ],
            ])
            ->add('quantity', IntegerType::class, [
                'constraints' => [
                    new NotBlank(),
                    new Type('numeric'),
                ],
            ]);
    }
}

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;

class OrderController extends AbstractController
{
    public function create(Request $request): Response
    {
        $form = $this->createForm(OrderFormType::class);
        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            // 处理表单数据
            // ...

            return $this->redirectToRoute('order_success');
        }

        return $this->render('order/create.html.twig', [
            'form' => $form->createView(),
        ]);
    }
}