RoleParamConverter

<?php
    namespace AcmeBundle\Services;

    use Doctrine\ORM\EntityManager;
    use Sensio\Bundle\FrameworkExtraBundle\Configuration\ParamConverter;
    use Sensio\Bundle\FrameworkExtraBundle\Request\ParamConverter\ParamConverterInterface;
    use Symfony\Component\HttpFoundation\Request;
    use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
    use Symfony\Component\Security\Core\SecurityContext;

    class RoleParamConverter implements ParamConverterInterface
    {
        /**
         * @var SecurityContext
         */
        private $securityContext;

        /**
         * @var EntityManager
         */
        private $entityManager;

        function __construct(SecurityContext $securityContext, EntityManager $entityManager)
        {
            $this->securityContext = $securityContext;
            $this->entityManager = $entityManager;
        }
        /**
         * Stores the object in the request.
         *
         * @param Request        $request       The request
         * @param ParamConverter $configuration Contains the name, class and options of the object
         *
         * @return bool    True if the object has been successfully set, else false
         */
        public function apply(Request $request, ParamConverter $configuration)
        {
            /** @var TokenInterface $token */
            $token = $this->securityContext->getToken();
            if ( $token == NULL ) {
                return NULL;
            }
            /** @var User $user */
            $user = $token->getUser();

            /** @var ProfileRepository|TeacherRepository $repo */
        $repo = $this->entityManager->getRepository($configuration->getClass());

            $object = $repo->findByUser($user);

            $request->attributes->set($configuration->getName(), $object);

            return TRUE;
        }
        /**
         * Checks if the object is supported.
         *
         * @param ParamConverter $configuration Should be an instance of ParamConverter
         *
         * @return bool    True if the object is supported, else false
         */
        public function supports(ParamConverter $configuration)
        {
            return in_array($configuration->getClass(), array("AcmeBundle:MyClass1", "AcmeBundle:MyClass2"));
        }
    }