无法在没有 data_class 的表单中使用回调断言 [英] Unable to use Callback assert with a form without data_class

问题描述

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，并且是整数类型.此自定义 FormType 将始终在没有 data_class 的情况下使用.

I'm creating a custom FormType called IntervalType. My IntervalType will have two fields, start and end and will be of type integer. This custom FormType will always be used without data_class.

我想添加一个约束来保证start 低于end.

I want to add a constraint to guarantee that start is lower than end.

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

How do I use the Symfony\Component\Validator\Constraints\Callback directly in a FormType without data_class?

这是我的IntervalType，仅供参考:

Here is my IntervalType, just for reference:

// 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(),
                ),
            ))
        );
    }
}

推荐答案

当表单不使用任何 data_class 时，唯一的选择似乎是回调约束.

When the form won't be using any data_class the only option seems to be the Callback constraint.

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();
        }
    }
}

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