Yii Model function for getting a name of a table by the relation field

gistfile1.txt

        public function get_name_by_relation_field($field) {
            $relations = $this->relations();
            $obj_name = NULL;
            foreach($relations as $relation) {
                if (isset($relation[2]) && $relation[2] == $field) {
                    $obj_name = isset($relation[1])?$relation[1]:NULL;
                    break;
                }
            }
            return $obj_name;
        }