vendor/sensio/framework-extra-bundle/Request/ParamConverter/DoctrineParamConverter.php

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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Sensio\Bundle\FrameworkExtraBundle\Request\ParamConverter;

use Sensio\Bundle\FrameworkExtraBundle\Configuration\ParamConverter;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
use Symfony\Component\HttpFoundation\Request;
use Doctrine\Common\Persistence\ManagerRegistry;
use Doctrine\ORM\NoResultException;

/**
 * DoctrineParamConverter.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class DoctrineParamConverter implements ParamConverterInterface
{
    /**
     * @var ManagerRegistry
     */
    protected $registry;

    public function __construct(ManagerRegistry $registry = null)
    {
        $this->registry = $registry;
    }

    /**
     * {@inheritdoc}
     *
     * @throws \LogicException       When unable to guess how to get a Doctrine instance from the request information
     * @throws NotFoundHttpException When object not found
     */
    public function apply(Request $request, ParamConverter $configuration)
    {
        $name = $configuration->getName();
        $class = $configuration->getClass();
        $options = $this->getOptions($configuration);

        if (null === $request->attributes->get($name, false)) {
            $configuration->setIsOptional(true);
        }

        // find by identifier?
        if (false === $object = $this->find($class, $request, $options, $name)) {
            // find by criteria
            if (false === $object = $this->findOneBy($class, $request, $options)) {
                if ($configuration->isOptional()) {
                    $object = null;
                } else {
                    throw new \LogicException(sprintf('Unable to guess how to get a Doctrine instance from the request information for parameter "%s".', $name));