Everzet\PersistedObjects\FileRepository::findById PHP Метод

    public function findById($id)
    {
        $id = $this->stringify($id);
        $db = $this->loadDb();
        if (!isset($db[$id])) {
            return null;
        }
        return $db[$id];
    }

 /** {@inheritdoc} */
 public function get(UuidInterface $reservationId)
 {
     if (null === ($reservation = $this->file->findById($reservationId))) {
         throw new ReservationDoesNotExist(sprintf('Reservation with id %s does not exist.', $reservationId));
     }
     return $reservation;
 }