Symfony 表单 - 在 CollectionType 中的子条目类型中访问实体 [英] Symfony form - Access Entity inside child entry Type in a CollectionType

问题描述

我正在尝试访问 FormBuilder 中父 CollectionType 中给定嵌入表单的实体:

I'm trying to access the entity for a given embedded form in the parent CollectionType inside FormBuilder:

ParentType

Class ParentType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('children', CollectionType::class, array(
            'entry_type' => ChildType::class
        );
    }
}

儿童类型

class ChildType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $child = $builder->getData(); // this returns null
    }

    public function getDefaultOptions(array $options)
    {
        return array(
            'data_class' => 'VendorBundleEntityChild',
        );
    }
}

虽然这在正常形式下有效，但 $child 被返回为 null.如何访问 ChildType 中的 Child 实体?

While this works in a normal form, $child is being returned as null. How can I access the Child entity inside ChildType?

推荐答案

答案在于使用 Event Listeners 来监听 PRE_SET_DATA 事件.

The answer lies in using Event Listeners which listen for the PRE_SET_DATA event.

它会给你的闭包传递一个 FormEvent 类，它包含表单和绑定到它的数据.

It will pass your closure a FormEvent class which contains both the form and the data being bound to it.

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder->addEventListener(FormEvents::PRE_SET_DATA,
        function (FormEvent $event) use ($builder)
        {
            $form = $event->getForm();
            $child = $event->getData();

            if ($child instanceof Child) {

                // Do what ever you like with $child entity data

            }
        }
    );
}

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