相关疑难解决方法(0)

我有一个Symfony2表单,有两个分层的动态字段.第一层在使用表单事件实现记录的方式时没有问题:http://symfony.com/doc/current/cookbook/form/dynamic_form_modification.html#dynamic-generation-for-submitted-forms

但接下来是第三个字段,它取决于第二个字段,它已经是一个动态字段.

为了演示这个问题,这里是我的剥离代码:

<?php
class ServiceeventType extends AbstractType
{
    /**
     * @param FormBuilderInterface $builder
     * @param array $options
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('park', 'entity', array(
                'class' => 'AppBundle:Park',
                'property' => 'identifyingName',
                'label' => 'Park',
                'required' => true,
                'invalid_message' => 'Choose a Park',
                'placeholder' => 'Please choose',
            ))
            // just a placeholder for the $builder->get('facility')->addEventListener to have something to bind to
            // I'm aware, that this is just a symptom of my problem …