public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults(['data_class' => SaveSettings::class, 'validation_groups' => function (FormInterface $form) {
$data = $form->getData();
if ($data->mailEngine != 'not_implemented') {
return array('Default', 'mail_engine_selected');
} else {
return array('Default');
}
}]);
}