Symfony表单 - 子条目中的访问实体输入CollectionType [英] Symfony form - Access Entity inside child entry Type in a CollectionType

问题描述

我正在尝试访问 FormBuilder 中的父 CollectionType 中的给定嵌入式窗体的实体： / p>

父类型

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

ChildType

  class ChildType extends AbstractType 
 {
 public function buildForm（FormBuilderInterface $ builder，array $ options）
 {
 $ child = $ builder-> getData（）; //返回null 
} 
 
 public function getDefaultOptions（array $ options）
 {
 return array（
'data_class'=>'Vendor\Bundle\Entity \\ Child'，
）; 
} 
} 
  

这以正常形式工作， $ child 正被返回为空。如何访问 ChildType 中的 Child 实体？

解决方案

答案在于使用事件侦听器，该侦听器侦听 PRE_SET_DATA 事件。

它会传递你的关闭一个 FormEvent 类，其中包含绑定到表单和数据的

  public function buildForm（FormBuilderInterface $ builder，array $ options）
 {
 $ builder-> addEventListener（FormEvents :: PRE_SET_DATA ，
函数（FormEvent $ event）use（$ builder）
 {
 $ form = $ event-> getForm（）; 
 $ child = $ event-> getData （）; 
 
 if（$ child instanceof Child）{
 
 //做你喜欢的$子实体数据
 
} 
} 
）; 
} 
  

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
        );
    }
}

ChildType

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' => 'Vendor\Bundle\Entity\Child',
        );
    }
}

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

解决方案

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

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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