Symfony フレームワークを使用してフォーム検証を実装する方法

<?php

namespace AppForm;

use SymfonyComponentFormAbstractType;
use SymfonyComponentFormExtensionCoreTypeTextType;
use SymfonyComponentFormExtensionCoreTypeEmailType;
use SymfonyComponentFormFormBuilderInterface;
use SymfonyComponentOptionsResolverOptionsResolver;
use SymfonyComponentValidatorConstraints as Assert;

class MyFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('name', TextType::class, [
                'label' => '姓名',
                'constraints' => [
                    new AssertNotBlank(['message' => '姓名不能为空']),
                    new AssertLength(['min' => 2, 'max' => 50, 'minMessage' => '姓名长度不能小于2个字符', 'maxMessage' => '姓名长度不能超过50个字符']),
                ],
            ])
            ->add('email', EmailType::class, [
                'label' => '邮箱',
                'constraints' => [
                    new AssertNotBlank(['message' => '邮箱不能为空']),
                    new AssertEmail(['message' => '邮箱格式不正确']),
                ],
            ]);
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'data_class' => MyFormData::class,
        ]);
    }
}

<?php

namespace AppEntity;

class MyFormData
{
    private $name;
    private $email;

    public function getName(): ?string
    {
        return $this->name;
    }

    public function setName(string $name): void
    {
        $this->name = $name;
    }

    public function getEmail(): ?string
    {
        return $this->email;
    }

    public function setEmail(string $email): void
    {
        $this->email = $email;
    }
}

<?php

namespace AppController;

use AppFormMyFormType;
use AppEntityMyFormData;
use SymfonyBundleFrameworkBundleControllerAbstractController;
use SymfonyComponentHttpFoundationRequest;
use SymfonyComponentHttpFoundationResponse;
use SymfonyComponentRoutingAnnotationRoute;

class MyFormController extends AbstractController
{   
    /**
     * @Route("/my-form", name="my_form")
     */
    public function myForm(Request $request): Response
    {
        $myFormData = new MyFormData();
        $form = $this->createForm(MyFormType::class, $myFormData);

        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            // 表单数据有效，保存到数据库等操作

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

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

    /**
     * @Route("/success", name="success")
     */
    public function success(): Response
    {
        return $this->render('my_form/success.html.twig');
    }
}

{% extends 'base.html.twig' %}

{% block body %}
    <h1>我的表单</h1>

    {{ form_start(myForm) }}
        {{ form_widget(myForm.name) }}
        {{ form_errors(myForm.name) }}
        
        {{ form_widget(myForm.email) }}
        {{ form_errors(myForm.email) }}

        <button type="submit">提交</button>
    {{ form_end(myForm) }}
{% endblock %}