Laravel雄辩查询，主查询和子查询回调函数上的链接groupBy

我试图查询项目模型&按groupId分组，然后按用户id进一步分组&合计销售数量，但出现错误。下面是我的代码

$items = Item::where('sold', true)->get()->groupBy('groupId', function ($query){
          $query->select(DB::raw('userid,sum(sales_count) as total_sales_count'))->groupBy('userid');
})->get();

我得到的错误如下：

Too few arguments to function Illuminate\Support\Collection::get(), 0 passed in 

预期结果雄辩\收集：

[
    17558 => [
        [
        "userid" => "2"
        "total_sales_count" => "3"
        ],
         [
        "userid" => "4"
        "total_sales_count" => "1"
        ],
    ],

    18647 => [
        [
        "userid" => "5"
        "total_sales_count" => "6"
        ],
         [
        "userid" => "7"
        "total_sales_count" => "4"
        ],
    ]
]

模型结构：

Schema::create('items', function (Blueprint $table) {
            $table->id();
            $table->integer('userid');
            $table->integer('sales_count')->default(1);
            $table->string('groupId')->nullable();
            $table->boolean('sold')->default(true);
        
            $table->timestamps();
});

---

您的查询应该是这样的-

$item = Item::where('sold', true)
        ->select('user_id', DB::raw('sum(items.sales_count) as total_sales_count'))
        ->groupBy('groupId')
        ->get();

---

删除第一个get，然后tryI尝试了该操作，但出现了以下错误：stripos希望参数1为字符串，object givenI尝试了该操作，但出现了以下错误：``SQLSTATE[42000]：语法错误或访问冲突：SELECT列表的1055表达式1不在GROUP BY子句中，并且包含未聚合的列“mydb.items.user_id”，该列在功能上不依赖GROUP BY子句中的列；这与sql不兼容。\u mode=only\u full\u group\u by sql:select user\u id，sumsales\u count as total\u sales\u count from items group by groupId``你能分享你的表结构吗？我已经更新了问题，将模型结构包括在内。