public function findDraftsBy(array $criteria, array $sort = null, $limit = null, $skip = null)
    {
        $criteria['isDraft'] = true;

        /** @noinspection PhpUndefinedClassInspection */
        /** @noinspection PhpUndefinedMethodInspection */
        return parent::findBy($criteria, $sort, $limit, $skip);
    }