chill-bundles/src/Bundle/ChillPersonBundle/Form/DataTransformer/PersonToIdTransformer.php

<?php

/**
 * Chill is a software for social workers
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

declare(strict_types=1);

namespace Chill\PersonBundle\Form\DataTransformer;

use Chill\PersonBundle\Entity\Person;
use Doctrine\Persistence\ObjectManager;
use Symfony\Component\Form\DataTransformerInterface;
use Symfony\Component\Form\Exception\TransformationFailedException;

class PersonToIdTransformer implements DataTransformerInterface
{
    /**
     * @var ObjectManager
     */
    private $om;

    public function __construct(ObjectManager $om)
    {
        $this->om = $om;
    }

    /**
     * Transforms a string (id) to an object (issue).
     *
     * @param  string $id
     *
     * @throws TransformationFailedException if object (issue) is not found.
     *
     * @return Person|null
     */
    public function reverseTransform($id)
    {
        if (!$id) {
            return null;
        }

        $issue = $this->om
            ->getRepository(\Chill\PersonBundle\Entity\Person::class)
            ->findOneBy(['id' => $id]);

        if (null === $issue) {
            throw new TransformationFailedException(sprintf(
                'An issue with id "%s" does not exist!',
                $id
            ));
        }

        return $issue;
    }

    /**
     * Transforms an object (issue) to a string (id).
     *
     * @param  Person|null $issue
     *
     * @return string
     */
    public function transform($issue)
    {
        if (null === $issue) {
            return '';
        }

        return $issue->getId();
    }
}