Hi Roger,
You should never rely on the form data in your type class (as you've
just discovered). When the form is constructed, you can never be
certain that the data is already available and won't be changed.
In your case, I recommend to add an event listener to the preBind and
preSetData events that overrides the 'city' field.
class ContactType extends AbstractType {
public function buildForm(FormBuilder $builder, array $options) {
$factory = $builder->getFormFactory();
$refreshCity = function ($form, $state) use ($factory) {
$form->add($factory->createNamed('entity', 'city', null, array(
'class' => 'Entity:Cities',
'query_builder' => function (EntityRepository
$repository) use ($state) {
return $respository->createQueryBuilder('cities')
->select(array('cities', 'zip_codes'))
->innerJoin('cities.zip_codes', 'zip_codes')
->where('cities.states = :state')
->setParameter('state', $state);
},
'property' => 'city_name',
'label' => 'City',
)));
};
$builder->addEventListener(Events::preSetData, function
(DataEvent $event) use ($refreshCity) {
$form = $event->getForm();
$data = $event->getData();
if ($data instanceof ContactInfo) {
$refreshCity($form, $data->getCity()->getState());
}
});
$builder->addEventListener(Events::preBind, function
(DataEvent $event) use ($refreshCity) {
$form = $event->getForm();
$data = $event->getData();
if (isset($data['state'])) {
$refreshCity($form, $data['state']);
}
});
Obviously this is untested, but I think this should work (with
probably minor modifications depending on your form).
Bernhard
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