提交后,在Symfony表单中取消设置字段

Question

在我的Symfony项目(2.7)中,我有一个Apartment具有很多属性的实体.其中之一就是Town. Town是其他学说实体,他们有一个City实体,并City有一个State.

在我的Apartment形式,我有3个选择.为和Town,City和State.但是当我想要保存时,我只想要保存Town.

...
$builder->add('town', 'entity', array(
    'label' => 'Town',
    'choices' => $towns,
    'class' => "AppBundle\Entity\Town"
));
$builder->add('city', 'entity', array(
    'label' => 'City',
    'choices' => $cities,
    'class' => "AppBundle\Entity\City"
));
$builder->add('state', 'entity', array(
    'label' => 'States',
    'choices' => $states,
    'class' => "AppBundle\Entity\State"
));
...

有可能取消了我不想保存实体公寓的额外字段吗？

if ($request->getMethod() == 'POST') {
    $form->handleRequest($request);

    if ($form->isValid()) {

        //I want to unset State and City entities. 
        $apartment = $form->getData();
        ...
    }

我有这个错误:

Neither the property "state" nor one of the methods "addState()"/"removeState()", "setState()", "state()", "__set()" or "__call()" exist and have public access in class "AppBundle\Entity\Apartment".

Answer 1

提交后,表单数据不能更改.但是您可以在提交完成之前附加事件监听器来执行此操作:

# Don't forget these
use Symfony\Component\Form\FormEvents;
use Symfony\Component\Form\FormEvent;

# ...

$builder->add('city', 'entity', array(
    'label' => 'City',
    'choices' => $cities,
    'class' => "AppBundle\Entity\City",
    'mapped' => FALSE // <-- This is important
));

$builder->addEventListener(FormEvents::POST_SUBMIT, function(FormEvent $event){
    $data = $event->getData();

    $data['city'] = NULL;
    $data['state'] = NULL;
    # We need this because of PHP's copy on write mechanism.
    $event->setData($data); 
});

如果你需要这些被NULL验证过程中,交换之前-ed POST_SUBMIT的SUBMIT.

现在,form->getData()在您的控制器内调用将返回NULL值.

希望这可以帮助...