从嵌套表单中调用 $builder->getData() 总是返回 NULL [英] Calling $builder->getData() from within a nested form always returns NULL

问题描述

我试图获取以嵌套形式存储的数据，但是在调用 $builder->getData() 时，我总是得到 NULL.

I'm trying to get data stored in a nested form but when calling $builder->getData() I'm always getting NULL.

有谁知道应该如何获取嵌套表单中的数据?

Does anyone knows what how one should get the data inside a nested form?

这是 ParentFormType.php:

Here's the ParentFormType.php:

class ParentFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('files', 'collection', array(
            'type'          => new FileType(),
            'allow_add'     => true,
            'allow_delete'  => true,
            'prototype'     => true,
            'by_reference'  => false
        );
    }
}

文件类型.php

class FileType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        // Each one of bellow calls returns NULL
        print_r($builder->getData());
        print_r($builder->getForm()->getData());
        die();

        $builder->add('file', 'file', array(
            'required'    => false,
            'file_path'   => 'file',
            'label'       => 'Select a file to be uploaded',
            'constraints' => array(
                new File(array(
                    'maxSize' => '1024k',        
                ))
            ))
        );
    }

    public function setDefaultOptions( \Symfony\Component\OptionsResolver\OptionsResolverInterface $resolver )
    {
        return $resolver->setDefaults( array() );
    }

    public function getName()
    {
        return 'FileType';
    }
}

谢谢！

推荐答案

需要使用 FormEvents::POST_SET_DATA 来获取表单对象:

You need to use the FormEvents::POST_SET_DATA to get the form object :

        $builder->addEventListener(FormEvents::POST_SET_DATA, function ($event) {
            $builder = $event->getForm(); // The FormBuilder
            $entity = $event->getData(); // The Form Object
            // Do whatever you want here!
        });

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