symfony2 2.3 missing FormBuilder::addValidator() how to adapt to FormBuilderInterface?

Question

Seems that the addValidator function of the FormBuilder is gone in the recent version of symfony2. Anyonw know how to rewrite that functionality?

Here's my 2.0 code:

    $builder-> addValidator(new CallbackValidator(function(FormInterface $form){
      $email = $form->get('email')->getData();      
        if (empty( $email )) {
          $form['email']->addError(new FormError("Du måste ange en epostadress för användaren"));
        }
    }));

I understand that the FormBuilder was replaced by "FormBuilderInterface" in 2.1, but I am still a bit confused as to what steps I need to take to rewrite this functionality.

Answer 1

Since Symfony 2.1 FormValidatorInterface which is implemented by CallbackValidator is deprecated, and removed in 2.3.

Upgrade to 2.1 file gives solution:

The interface FormValidatorInterface was deprecated and will be removed in Symfony 2.3.

If you implemented custom validators using this interface, you can substitute them by event listeners listening to the FormEvents::POST_BIND (or any other of the *BIND events). In case you used the CallbackValidator class, you should now pass the callback directly to addEventListener.