validation - Symfony 表单验证约束表达式

Question

我有表单，需要创建内联验证：

$builder
        ->add('Count1', 'integer', [
            'data'        => 1,
            'constraints' => [
                new NotBlank(),
                new NotNull(),
            ],
        ])
        ->add('Count2', 'integer', [
            'constraints' => [
                new NotBlank(),
                new NotNull(),
            ],
        ])
        ->add('Count3', 'integer', [
            'data'        => 0,
            'constraints' => [
                new NotBlank(),
                new NotNull(),
            ],
        ])

如何白内联验证表达式为规则

1. 计数2 >=计数1
2. 计数3 <=计数2
3. Count2 >= $someVariable

Answer 1

对案例 1 和 2使用表达式约束的其他解决方案。

use Symfony\Component\Validator\Constraints as Assert;

// ...

public function configureOptions(OptionsResolver $resolver)
{
    $resolver->setDefaults([
        'constraints' => [
            new Assert\Expression([
                'expression' => 'value["Count2"] >= value["Count1"]',
                'message' => 'count2 must be greater than or equal to count1'
            ]),
            new Assert\Expression([
                'expression' => 'value["Count3"] <= value["Count2"]',
                'message' => 'count3 must be less than or equal to count2'
            ]),
        ],
    ]);
}

对于案例 3，您可以直接在字段上使用Assert\GreaterThanOrEqual约束。Count2

我猜你的表单没有绑定对象模型，否则阅读所引用的文档就足够了，而且更好，因为你可以直接在你的属性上使用这些表达式。

Answer 2

您可以使用CallbackValidator（文档）：

在您的情况下，为了验证一个字段，您需要将约束添加到表单类型，而不是字段：

public function setDefaultOptions(OptionsResolverInterface $resolver)
{
    $resolver->setDefaults(array(
        'constraints' => array(
            new Assert\Callback(function($data){
                // $data is instance of object (or array) with all properties
                // you can compare Count1, Count2 and Count 3 
                // and raise validation errors
            });
        )
    ));
}

如果您constraints不想将其设置在setDefaultOptions.

Answer 3

从最简单的开始

3) Count2 >= $someVariable

    ->add('Count3', 'integer', [
        'data'        => 0,
        'constraints' => [
            new NotBlank(),
            new NotNull(),
            new GreaterThanOrEqual($someVariable),
        ],
    ])

1）对于两个首先，您必须为类范围而不是属性范围实现约束。并为整个表单分配这些约束

public function buildForm(FormBuilderInterface $builder, array $options)
{
   $builder
    ->add('Count1', 'integer', [
        'data'        => 1,
        'constraints' => [
            new NotBlank(),
            new NotNull(),
        ],
    ])
    ->add('Count2', 'integer', [
        'constraints' => [
            new NotBlank(),
            new NotNull(),
        ],
    ])
    ->add('Count3', 'integer', [
        'data'        => 0,
        'constraints' => [
            new NotBlank(),
            new NotNull(),
        ],
    ])
}

public function setDefaultOptions(OptionsResolverInterface $resolver)
{
     $resolver->setDefaults(['constraints' => [
            new YourCustomConstraint(),
          ]]);
}

如何实现验证器，请参阅文档。但是在你的YourCustomConstraintValidator你会有类似的东西

public function validate($value, Constraint $constraint)
{
     if ($value->getCount1() > $value->getCount2() {
           $this->context->addViolation(...);
     }
}

Answer 4

我在使用 Symfony 的表达式比较两个日期时遇到了一些问题。

这是有效的代码：

 $builder->add(
            'end',
            DateTimeType::class,
            [
                'label' => 'Campaign Ends At',
                'data' => $entity->getEnd(),
                'required' => true,
                'disabled' => $disabled,
                'widget'  => 'single_text',
                'constraints' => [
                    new Assert\GreaterThan(['value' => 'today']),
                    new Assert\Expression(
                                [
                                    //here end and start are the name of two fields
                                    'expression' => 'value > this.getParent()["start"].getData()',
                                    'message' => 'my.form.error.end.date.bigger.than.start'
                                ]
                            ),
                ]

            ]
        );