TransformationFailureExtension.php (testing only)

TransformationFailureExtension.php

<?php

use Symfony\Component\Form\AbstractTypeExtension;
use Symfony\Component\Form\Extension\Core\Type\FormType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\Form\FormError;
use Symfony\Component\Form\FormEvent;
use Symfony\Component\Form\FormEvents;

class TransformationFailureExtension extends AbstractTypeExtension
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->addEventSubscriber(new TransformationFailureListener());
    }

    public static function getExtendedTypes(): iterable
    {
        return [FormType::class];
    }
}

class TransformationFailureListener implements EventSubscriberInterface
{
    public static function getSubscribedEvents()
    {
        return [
            FormEvents::POST_SUBMIT => ['convertTransformationFailureToFormError', -1024],
        ];
    }

    public function convertTransformationFailureToFormError(FormEvent $event)
    {
        $form = $event->getForm();

        if ($form->getTransformationFailure() === null || ! $form->isValid()) {
            return;
        }

        foreach ($form as $child) {
            if (! $child->isSynchronized()) {
                return;
            }
        }

        $clientDataAsString = is_scalar($form->getViewData()) ? (string) $form->getViewData() : \gettype($form->getViewData());
        $config             = $form->getConfig();

        $messageTemplate   = $config->getOption('invalid_message');
        $messageParameters = array_replace(['{{ value }}' => $clientDataAsString], $config->getOption('invalid_message_parameters'));
        $message           = strtr($messageTemplate, $messageParameters);

        $form->addError(new FormError($message, $messageTemplate, $messageParameters, null, $form->getTransformationFailure()));
    }
}