Valdiator for related entites

Question

I have two entities, i want to have a custom validator constraint to ensure that both entities share one value.

Example:

Entity Region:

• has field city
• has multiple houses as OneToMany relation
• constraint to allow only houses that have the same city

Entity House:

• has field city
• has one region as ManyToOne relation

your answer with any hints on how to achieve this is highly appreciated.

Answer 1

Here is a solution to achieve what you want to do:

In your FormType, add an event listener on PRE_SUBMIT and add the constraint in like this:

use Symfony\Component\Form\FormEvent;
use Symfony\Component\Form\FormEvents;
use Symfony\Component\Validator\Constraints\EqualTo;

// ...

$builder->addEventListener(FormEvents::PRE_SUBMIT, function (FormEvent $event) {
    $data = $event->getData();
    $form = $event->getForm();

    if (isset($data['cityA'])) {
        $form->add('cityB', TextType::class, [
            'constraints' => [
                new EqualTo([
                    'value' => $data['cityA'],
                    'message' => 'Must be the same as cityA',
                ]),
            ],
        ]);
    }

    // Here other constraints
});