Disable backend validation for choice field in Symfony 2 Type

Question

Is it possible to disable backend (server-side) validation for the specified field?

Wnen Im trying to send form with dynamicly loaded options I get error "ERROR: This value is not valid."

I think symfony is checking if my value is on the default declared list (in my case its empty list), if not returns false.

Answer 1

It's confusing but this behaviour is not really validation related as it is caused by the "ChoiceToValueTransformer" which indeed searches for entries in your pre-declared list. If your list is empty or you want to disable the transformer you can simply reset it.

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder->add('yourField', 'choice', array('required'=>false));

    //more fields...

    $builder->get('yourField')->resetViewTransformers();
}

Then your custom defined validation will step in (if it exists).

Answer 2

I found the solution

Symfony2.4 form 'This form should not contain extra fields' error

For more details: http://symfony.com/doc/current/cookbook/form/dynamic_form_modification.html#cookbook-dynamic-form-modification-suppressing-form-validation