如何在Symfony中多次嵌入表单

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

class MainFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('subForms', CollectionType::class, [
                'entry_type' => SubFormType::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\FormBuilderInterface;

class SubFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('name', TextType::class);
    }
}

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Annotation\Route;

class FormController extends AbstractController
{
    /**
     * @Route("/form", name="form")
     */
    public function index(Request $request)
    {
        $form = $this->createForm(MainFormType::class);

        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            // 处理表单提交逻辑
        }

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

{{ form_start(form) }}

{{ form_row(form.subForms) }}

{{ form_end(form) }}