我有一份雇主资料表单，我正在尝试将State Employer所在的City与EntityManager相关联，此部分工作正常，但FormType变长了这个在网站的其他地方需要这个功能，所以我决定在EventSubscriber中移动这个逻辑，并在需要的地方重复使用它。
我遇到的问题是我正试图解决如何在EventSubscriber类中注入services.yml。
我知道我可以在我的app.form.location:
class: AppBundle\Form\EventListener\AddStateFieldSubscriber
arguments: ['@doctrine.orm.entity_manager']
tags:
- { name: kernel.event_subscriber }
中添加以下代码，并且应该这样做但它不起作用。
EmployerProfileType这是我的addEventSubscriber，我在呼叫AddStateFieldSubscriber()，class EmployerProfileType extends AbstractType
{
protected $em;
function __construct(EntityManager $em)
{
$this->em = $em;
}
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('firstName', TextType::class)
->add('lastName', TextType::class)
->add('companyName', TextType::class)
->add('companyProfile', TextareaType::class)
->add('companyLogo', FileType::class, array(
'data_class' => null
));
$builder->addEventSubscriber(new AddStateFieldSubscriber());
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'AppBundle\Entity\EmployerProfile',
));
}
public function getName()
{
return 'app_bundle_emp_profile_type';
}
}
AddStateFieldSubscriber这是我的EntityManager课程，我需要访问class AddStateFieldSubscriber implements EventSubscriberInterface
{
protected $em;
function __construct(EntityManager $em)
{
$this->em = $em;
}
public static function getSubscribedEvents()
{
// Tells the dispatcher that you want to listen on the form.pre_set_data
// event and that the preSetData method should be called.
return array(
FormEvents::PRE_SET_DATA => 'onPreSetData',
FormEvents::PRE_SUBMIT => 'onPreSubmit'
);
}
protected function addElements(FormInterface $form, States $province = null)
{
// Remove the submit button, we will place this at the end of the form later
// Add the province element
$form->add('state', EntityType::class, array(
'data' => $province,
'placeholder' => 'provide_state',
'class' => 'AdminBundle\Entity\States',
'mapped' => false)
);
// Cities are empty, unless we actually supplied a province
$cities = array();
if ($province) {
// Fetch the cities from specified province
$repo = $this->em->getRepository('AdminBundle:Cities');
$cities = $repo->findByStates($province, array('name' => 'asc'));
}
// Add the city element
$form->add('city', EntityType::class, array(
'placeholder' => 'provide_state_first',
'class' => 'AdminBundle\Entity\Cities',
'choices' => $cities,
));
}
function onPreSubmit(FormEvent $event) {
$form = $event->getForm();
$data = $event->getData();
// Note that the data is not yet hydrated into the entity.
$province = $this->em->getRepository('AdminBundle:States')->find($data['state']);
$this->addElements($form, $province);
}
function onPreSetData(FormEvent $event) {
$account = $event->getData();
$form = $event->getForm();
// We might have an empty account (when we insert a new account, for instance)
$province = $account->getCity() ? $account->getCity()->getStates() : null;
$this->addElements($form, $province);
}
}
EntityManager我得到的错误是
捕获致命错误：参数1传递给 的appbundle \表格\事件监听\ AddStateFieldSubscriber :: __结构（） 必须是Doctrine \ ORM \ EntityManager的一个实例，没有给定，调用 在 /Users/shairyar/Sites/clickjobboard/src/AppBundle/Form/EmployerProfileType.php 在第48行并定义
我通过服务注入EmployerProfileType然后为什么会出现此错误？
如果在$builder->addEventSubscriber(new AddStateFieldSubscriber();内，我会替换
$builder->addEventSubscriber(new AddStateFieldSubscriber($this->em));
至
EntityManager
然后事情开始正常。
我认为在Symfony中我们应该通过创建服务注入依赖项？那么如何在AddStateFieldSubscriber()类
我做错了什么？可能是我在思考它。
欢迎任何反馈。
答案 0 :(得分：0)
我认为您需要将AddStateFieldSubscriber标记为kernel.event_subscriber。
然后表单内部的绑定根本不需要。
相反，您需要检查正确的表单，如果表单不是使用该订阅者的表单之一，则跳出事件侦听器方法，因为事件将在任何表单上触发，而不仅仅是EmployerProfileType表单