public function toRet(array $merge = [])
    {
        if ($this->isColl()) {
            return $this->suc($merge + [
                    'data' => $this,
                    'page' => $this->getSqlPart('page'),
                    'rows' => $this->getSqlPart('limit'),
                    'records' => $this->count(),
                ]);
        } else {
            return $this->suc($merge + ['data' => $this]);
        }
    }