Question

我正在创建一个名为IntervalType的自定义FormType。我的IntervalType将有两个字段start和end，其类型为整数。此自定义FormType将始终在没有data_class的情况下使用。

我想添加一个约束来保证start低于end。

如何在没有data_class的FormType中直接使用Symfony \ Component \ Validator \ Constraints \ Callback？

这是我的IntervalType，仅供参考：

// src/AppBundle/Form/Type/IntervalType.php
namespace AppBundle\Form;

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

class TaskType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('start', IntegerType::class, array(
                'constraints' => array(
                    new NotBlank(),
                ),
            ))
            ->add('end', IntegerType::class, array(
                'constraints' => array(
                    new NotBlank(),
                ),
            ))
        );
    }
}

Answer 1

当表单不能使用任何data_class时，唯一的选项似乎是Callback约束。

namespace AppBundle\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\Form\Extension\Core\Type\SubmitType;
use Symfony\Component\Form\Extension\Core\Type\IntegerType;
use Symfony\Component\Validator\Constraints\Callback;
use Symfony\Component\Validator\Constraints\NotBlank;
use Symfony\Component\Validator\Context\ExecutionContextInterface;

class IntervalType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('start', IntegerType::class, array(
                'constraints' => array(
                    new NotBlank(),
                ),
            ))
            ->add('end', IntegerType::class, array(
                'constraints' => array(
                    new NotBlank(),
                    new Callback(array($this, 'validateInterval')),
                ),
            ))
            ->add('submit', SubmitType::class);
    }

    public function validateInterval($value, ExecutionContextInterface $context)
    {
        $form = $context->getRoot();
        $data = $form->getData();

        if ($data['start'] >= $value) {
            $context
                ->buildViolation('The end value has to be higher than the start value')
                ->addViolation();
        }
    }
}

无法使用不带data_class

1 个答案: