Symfony: Custom subform validation - php

Question

I have form witch uses custom non-mapped subform.
public function buildForm(FormBuilderInterface $builder, array $options) {
$builder->add('subtype', 'my-subtype');
}
}
The subform is consisting of multiple fields and I need to perform additional check on both of them together. The Callback constraint is perfect for the job. However I can not find a way how to add this constraint on the subform as a whole.
So far I have tried to set the Callback in setDefaultOptions() or set it with setAttribute() in buildForm() but the callback is not evaluated.
Currently I am just adding the Callback to one of the fields:
public function buildForm(FormBuilderInterface $builder, array $options) {
$builder->add('field1', 'text')
->add(
'field2', 'text',
array(
'constraints' => array(
new Callback(array(
'methods' => array(array($this, 'validateMyType'))
))
)
));
}
public function validateMyType($data, ExecutionContextInterface $context) {
// Validation failed...
$context->addViolationAt('subtype', "mySubtypeViolation");
return;
}
This however prevents me to add the violation on the whole subtype. What ever I use in addViolationAt() the violation is always added to field which hosts the Callback constraint.

Answer 1

I'm surprised you can't add the Callback in setDefaultOptions(), because I just tested this and this works. That's definitely how I would have done it at first.
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults([
'constraints' => new Callback([$this, 'test'])
]);
}
public function test($data, ExecutionContextInterface $context)
{
return;
}
And test method was executed (I checked using debugger).

Answer 2

Firstly I had typo in the configuration so the callback method was not triggered. Secondly the error-bubbling was automatically set so the error was added to the whole form. So only what I needed was to manually disable it.
public function setDefaultOptions(OptionsResolverInterface $resolver) {
$resolver->setDefaults([
'error_bubbling' => false, // Automatically set to true for compound forms.
'constraints' =>
array(
new Callback(array(
'methods' => array(array($this, 'validateMyType'))
))
)]);
}
Than the violation is added like for any other callback:
public function validateFacrMembership($data, ExecutionContextInterface $context) {
$context->addViolation("invalidValueMessage");
}