forms - Symfony2 : my form returns false from isValid() but empty array for getErrors() from unique constraint condition

Question

我有一个客户实体，它只有一个唯一的电子邮件字段。我正在尝试编辑客户的电子邮件并且验证工作正常。但是我的 Controller 中有这个:

public function updateAction(Request $request, $id) {
    $em = $this->getDoctrine()->getManager();

    $entity = $em->getRepository('AcmeDemoBundle:Customer')->find($id);

    if (!$entity) {
        throw $this->createNotFoundException('Unable to find Customer entity.');
    }


    $editForm = $this->createForm(new CustomerType(), $entity);
    $editForm->bind($request);
    if ($editForm->isValid()) {
        $em->persist($entity);
        $em->flush();

        return $this->redirect($this->generateUrl('ticket_result'));
    }
    var_dump($editForm->getErrors());

    return $this->render('AcmeDemoBundle:Customer:edit.html.twig', array(
                'entity' => $entity,
                'edit_form' => $editForm->createView(),
    ));
}

var_dump 返回一个空数组，但验证器设置一个唯一错误，并且 $editForm->isValid() 返回 false。有没有办法在验证期间检查 Controller 中的特定错误，您还能解释为什么它返回空错误数组吗？基本上，如果出现错误，我想提供“合并”选项。

编辑:这是表单类型:

namespace Acme\DemoBundle\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;

class CustomerType extends AbstractType {


    public function buildForm(FormBuilderInterface $builder, array $options) {
        $builder
                ->add('email', 'email', array('required'=>true))
        ;

    }

    public function setDefaultOptions(OptionsResolverInterface $resolver) {
        $resolver->setDefaults(array(
            'data_class' => 'Acme\DemoBundle\Entity\Customer',
            'cascade_validation' => true,
        ));
    }

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

还有 Twig 模板:

{% extends 'AcmeDemoBundle::layout.html.twig' %}
{% block body -%}
    <h1>Customer edit</h1>



  <form action="{{ path('customer_update', { 'id': entity.id }) }}" method="post" {{ form_enctype(edit_form) }}>
        <input type="hidden" name="_method" value="PUT" />
        {{ form_widget(edit_form) }}
        <p>
            <button type="submit">Edit</button>
        </p>
    </form>

{% endblock %}

这是我的验证:

Acme\DemoBundle\Entity\Customer:
    constraints:
      - Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity: 
          fields: email
          message: "A customer under that email address already exists"

    properties:
        email:
            - Email: ~

Answer 1

出于调试目的，如果您使用 Symfony 2，您可以使用 $form->getErrorsAsString() 而不是 $form->getErrors()。*

引自this answer :

$form->getErrorsAsString() should only be used to debug the form...it will contain the errors of each child elements which is not the case of $form->getErrors().

<小时/>

更新1:

“对于较新的 Symfony 版本，您必须改用 $form->getErrors(true, false);。第一个参数对应于 deep，第二个参数对应于 展平”(参见@Roubi的评论)