laravel分类group by 语句

laravel分类group by 语句:

public function index()
    {
        $res = TagModel::select(['type'])
            ->where('user_id', $this->uid())
            ->selectRaw('group_concat(name) as names')
            ->groupBy('type')
            ->pluck('names', 'type');
        return out_put_json($res);
    }