DB 返回数组 toArray 并不能用...

代码：

$list = DB::table('goodsshops')
            ->join('users', 'users.id', '=', 'goodsshops.shop_id')
            ->select('users.id','users.name',DB::raw('group_concat(goodsshops.id) as cart_id'))
            ->where('goodsshops.user_id',$user->id)
            ->groupBy('goodsshops.shop_id')
            ->get()
            ->toArray();
        dd($list);

错误信息：

Call to a member function toArray() on array

也就是DB join时怎么返回 数组...