symfony 3.4 :表单:使用数据转换器

use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;

class MyFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('name', TextType::class, [
                'label' => 'Name',
                'required' => true,
                'invalid_message' => 'Invalid name',
                'data' => 'John Doe', // 默认值
                'empty_data' => '', // 空值处理
                'trim' => true, // 清理数据
                'attr' => [
                    'placeholder' => 'Enter your name',
                ],
                'invalid_message_parameters' => [
                    '{{ value }}' => 'John Doe',
                ],
                'error_bubbling' => true, // 错误冒泡
                'error_mapping' => [
                    '.' => 'name',
                ],
                'label_attr' => [
                    'class' => 'form-label',
                ],
                'help' => 'Please enter your name',
                'help_attr' => [
                    'class' => 'form-help',
                ],
                'property_path' => 'user.name', // 数据映射
                'empty_data' => function (FormInterface $form) {
                    return $form->getConfig()->getOption('required') ? '' : null;
                },
                'constraints' => [
                    new NotBlank(),
                    new Length(['min' => 2]),
                ],
                'invalid_message' => 'Invalid name',
                'invalid_message_parameters' => [
                    '{{ value }}' => 'John Doe',
                ],
                'error_bubbling' => true,
                'error_mapping' => [
                    '.' => 'name',
                ],
                'label_attr' => [
                    'class' => 'form-label',
                ],
                'help' => 'Please enter your name',
                'help_attr' => [
                    'class' => 'form-help',
                ],
                'property_path' => 'user.name',
                'empty_data' => function (FormInterface $form) {
                    return $form->getConfig()->getOption('required') ? '' : null;
                },
                'constraints' => [
                    new NotBlank(),
                    new Length(['min' => 2]),
                ],
            ]);
    }

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