将约束传递给 symfony 集合类型答案

【问题标题】：Passing constraints to symfony collection type将约束传递给 symfony 集合类型
【发布时间】：2017-07-13 09:49:06
【问题描述】：

Symfony 2.8。我正在使用带有自定义条目的集合作为表单，并传递了一些约束。现在我的代码看起来像：

FirstFormType.php:

class FirstFormType extends AbstractFormType
{
    /** @inheritdoc */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('rates', CollectionType::class, [
                'entry_type'   => new SecondFormType([new LessThanOrEqual(300)]),
                'allow_add'    => true,
                'allow_delete' => true,
                'delete_empty' => true,
                'constraints'  => [
                    new NotBlank(),
                    new Count(['min' => 1]),
                ],
            ])
        ;
    }
}

SecondFormType.php:

class SecondFormType extends AbstractFormType
{
    /** @var array */
    private $constraints;

    /** @param array $constraints */
    public function __construct(array $constraints = [])
    {
        $this->constraints = $constraints;
    }

    /** @inheritdoc */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('amount', NumberType::class, [
                'scale'       => 2,
                'constraints' => array_merge($this->constraints, [new CustomConstraint()]),
            ])
        ;
    }
}

我还有ThirdFormType，它与FirstFormType 相同，但将其他约束传递给SecondFormType。但是我想把new SecondFormType([...])换成FQCN，我觉得可以更正确地继承约束。你有什么想法我该怎么做？

【问题讨论】：

标签： php symfony symfony-forms symfony-2.8 symfony-validator

【解决方案1】：

从表单类型迁移这种构造函数参数的推荐方法是为它们创建表单选项，如下所示：

public function configureOptions(OptionsResolver $resolver)
{
    $resolver->setDefault('amount_constraints', array());
}

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
        ->add('amount', NumberType::class, [
            'scale' => 2,
            'constraints' => array_merge($options['amount_constraints'], [new CustomConstraint()]),
        ])
    ;
}

然后，您的新选项的用法如下所示：

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
        ->add('rates', CollectionType::class, [
            'entry_type'   => SecondFormType::class,
            'entry_options' => [
                'amount_constraints' => [new LessThanOrEqual(300)], 
            ],
            // ...
        ])
    ;
}

【讨论】：