Symfony form validation errors are displayed twice - php

Question

I need a simple form for the registration of a user. The form validation works as expected, except for the fact that the validation errors coming from a callback-constraint are shown twice for some reason.
I inserted a random number in an error message to see if the callback was called once or twice. The 2 error messages show the same random number, so the calback is (probably) only called once.
Any help is greatly appreciated!
Extra question: "All the errors from the callback function are shown on the same place in the form (as expected) . Is it ( easily ) possible to specify the field at which a validation error should be dislayed? "
The form type class looks as follows :
class RegisterType extends AbstractType{
static private $em;
static private $translator;
public function __construct( EntityManager $em , TranslatorInterface $translator){
RegisterType::$em = $em;
RegisterType::$translator = $translator;
}
public function buildForm(FormBuilderInterface $builder , array $options){
$builder
->add('email','email',[
'attr'=>['placeholder'=>RegisterType::$translator->trans('your.email')],
'label'=>false ,
'constraints'=>[new NotBlank() , new Assert\Email()]])
->add('password','password',[
'attr'=>['placeholder'=>RegisterType::$translator->trans('your.password')],
'label'=>false ,
'constraints'=>[new NotBlank()]])
->add('confirmPassword','password',[
'attr'=>['placeholder'=>RegisterType::$translator->trans('confirm.password')],
'label'=>false ,
'constraints'=>[new NotBlank()]]);
}
public function getName(){
return 'register';
}
public function configureOptions( OptionsResolver $resolver)
{
$resolver->setDefaults(array(
'constraints' =>array( new Assert\Callback( array('AppBundle\Forms\Type\RegisterType','validateForm' ) )),
));
}
static public function validateForm(array $data, ExecutionContextInterface $context){
if($data['email']){
$user = RegisterType::$em->getRepository('AppBundle:User')->findByEmail($data['email']);
if($user){
$context->buildViolation('email.is.used'.rand())->addViolation();
}
}
if($data['password'] && $data['confirmPassword']){
if($data['password'] != $data['confirmPassword']){
$context->buildViolation('password.confirm.failed')->addViolation();
}
}
}
The form is called in a controller as follows:
public function registerFormAction(Request $request){
$form = $this->createForm('register');
$form->handleRequest($request);
if($form->isValid()){
//TODO
}
return new JsonResponse(['success'=>false,
'message'=>$this->renderView('AppBundle:Security:register.html.twig' , ['form'=>$form->createView()])
]);
}
The twig template used to render the form is :
{% form_theme form _self %}
{%- block form_row -%}
<div class = "form-group">
{{- form_errors(form) -}}
{{- form_widget(form) -}}
</div>
{%- endblock form_row -%}
{{ form(form) }}

Answer 1

You are displaying the form errors and form widgets twice!
You have
<div class = "form-group">
{{- form_errors(form) -}} //displays all form errors
{{- form_widget(form) -}} //displays all form widgets (not the labels!)
</div>
and
{{ form(form) }} //displays the whole form
in your code.
Why don't you just render the form by yourself, then you can also set where the form errors should be shown.
{{ form_start(form) }}
<div class="form-group">
{{ form_errors(form.username) }} //errors for the "username" field of your form
{{ form_label(form.username) }} //labels for the "username" field of your form
{{ form_widget(form.username) }} //formfields for the "username" field of your form
</div>
{{ form_end(form) }}
Also, there's a twig function called form_rest(form) which will display all form fields that aren't manuelly rendered yet!

Answer 2

It turned out that the {% form_theme form _self %} functionality can only be used if your template extends another template.
So i put the form_row block in another file and i used
{% form_theme form "otherfile.htmltwig"%}
Which worked fine.