lithium\data\model\Query::childs PHP Method

    public function childs($relpath = null, $query = null)
    {
        if (!($model = $this->model())) {
            throw new ConfigException("No binded model.");
        }
        if ($query) {
            $this->_childs[$relpath] = $query;
            return $this;
        }
        return $this->_childs;
    }