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

问题:

I have a Customer entity that only has a unique Email field to it. I am trying to edit a customer's email and the validation works fine. However I have this in my controller:

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(),     )); }

The var_dump returns an empty array but the validator sets a unique error and the $editForm->isValid() returns false. Is there a way to check for that specific error in the controller during validation, also can you explain why it returns an empty error array? Basically, I would like to provide the "merge" option if that error comes up.

EDIT: here is the formtype:

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';     } }

And the twig template:

{% 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 %}

Here is my validation:

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: ~

回答1:

For debug purposes you can use $form->getErrorsAsString() instead of $form->getErrors() if you use Symfony 2.*

Quoted from 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().

---

UPDATE 1:

"With more recent Symfony versions, you must use $form->getErrors(true, false); instead. First param corresponds to deep and second to flatten" (see the comment by @Roubi)

回答2:

Ok, found an answer here:

Symfony2 invalid form without errors

It turns out each form child has it's own separate errors. When doing a var_dump of

$editForm->getChildren()['email']->getErrors()

I get:

array (size=1)   0 =>      object(Symfony\Component\Form\FormError)[531]       private 'message' => string 'A customer under that email address already exists' (length=50)       protected 'messageTemplate' => string 'A customer under that email address already exists' (length=50)       protected 'messageParameters' =>          array (size=0)           empty       protected 'messagePluralization' => null

I am still wondering how to determine that the error is because of a unique conflict without parsing the error message string.

回答3:

You can use error_bubbling on each field to bubble the error up to your $form.

If not, you can also foreach through the errors

foreach ($children as $child) {             if ($child->hasErrors()) {                 $vars = $child->createView()->getVars();                 $errors = $child->getErrors();                 foreach ($errors as $error) {                     $this->allErrors[$vars["name"]][] = $this->convertFormErrorObjToString($error);                 }             } }

回答4:

In Symfony 2.3, you can use this one :

if ($form->isValid()){     # Code... } else {     foreach ($form->getIterator() as $key => $child) {         if ($child instanceof Form) {             foreach ($child->getErrors() as $error) {                 $errors[$key] = $error->getMessage();             }         }     } }

This will get you an array ($errors) with the errors from the children.

回答5:

You could try to use the dump function when the form is submited and not valid. I use it like this

if($form->isSubmited() && $form->isValid()){    //SAVE TO DATABASE AND DO YOUR STUFF }else if($form->isSubmited()){   //SUBMITED BUT WITH ERRORS    dump($form->getErrors(true));    die();  }

Note this is for debugging purposes only, It will show you your form, the data in it and all the errors any field could have. In production mode you should return the error to the view and show them to the user.

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