Laravel如果父母数据不存在，我该如何存放父母的孩子

Question

因此，我想在我的Laravel API中创建一个卡产品功能，我创建了一张桌子，其中产品属于Cartsdetail和Carts有许多CartsDetail，我在CartDetail Controller中制作了一个功能商店，我想将一些CartDetail存储在1个购物车中，但我是我的。当我将数据存储在Postman中时，在CartDetail Controller中遇到问题，购物车ID还会增加。我希望它就像数据推车（CARTS_ID）不存在 - 商店request-＆gt; carts_id，如果存在返回存储购物车details。 ERD看起来像这样

我的CartDetail控制器：

public function store(Request $request)
 $this->validate($request, [
            'carts_id' => 'required',
            'products_id' => 'required',
            'quantity' => 'required'
  ]);
        $useritem = $request->user();
        $productitem = Products::findOrFail($request->products_id);
        $cart = Cart::where('users_id', $useritem->id)->where('status', 'carts')->first();

        if ($cart) {
            $itemcart = $cart;
        }else{
            $no_invoice = Cart::where('users_id', $useritem->id)->count();
            $inputancart['id'] = $request->carts_id;
            $inputancart['users_id']= $useritem->id;
            $inputancart['no_resi'] = Str::random(10).' ' .str_pad(($no_invoice + 1), '3', '0', STR_PAD_LEFT);
            $inputancart['status'] = 'cart';
            $itemcart = Cart::create($inputancart);
        }
        $cekdetail = CartDetails::where('carts_id', $itemcart->id)->where('products_id', $productitem->id)->first();
        $quantity = $request->quantity;
        $price = $productitem->price;
        $discount = $productitem->discount != null ? $productitem->discount->discount_nominal: 0;
        $subtotal = ($quantity * $price) - $discount;

        if ($cekdetail){
            $cekdetail->updatedetail($cekdetail, $quantity, $price, $discount);
            $cekdetail->carts->updatetotal($cekdetail, $quantity, $price, $discount);
        } else {
            $inputan = $request->all();
            $inputan['carts_id'] = $request->carts_id;
            $inputan['products_id'] = $productitem->id;
            $inputan['quantity'] = $quantity;
            $inputan['price'] = $price;
            $inputan['discount'] = $discount;
            $inputan['subtotal'] = ($price * $quantity) - $discount;
            $itemdetail = CartDetails::create($inputan);
            $itemdetail->carts->updatetotal($itemdetail->carts, $subtotal);
        }
        return response()->json(['Product successfully added to cart']);
    }


//model cartdetail
public function updatedetail($itemdetail, $quantity, $price, $voucher){
    $this->attributes['quantity'] = $itemdetail->quantity + $quantity;
    $this->attributs['subtotal'] = $itemdetail->subtotal + ($quantity * ($price - $voucher));
    self::save();
}
public function updatetotal($itemcart, $subtotal){
    $this->attributes['subtotal']= $itemcart->subtotal + $subtotal;
    $this->attributes['total']= $itemcart->total +$subtotal;
    self::save();
}

//index cart controller
 public function index(Request $request)
{
    $itemuser = $request->user();
    $itemcart = Cart::where('users_id', $itemuser->id)->where('status', 'cart')->with('cartdetails')->get();
    return response()->json(['data' => 'Shopping cart', 'itemcart'=> $itemcart], 300);
}

我认为问题仅在这里

（编辑）这不是可见的错误，但是它复制了我的父级数据（购物车），第一店不是

first store was :   
"itemcart": [
        {
            "id": 1,
            "users_id": 3,
            "no_resi": "oxIkpZ3xhl 001",
            "discount": 0,
            "subtotal": 300000,
            "status": "cart",
            "total": 300000,
            "created_at": "2022-04-08T06:25:06.000000Z",
            "updated_at": "2022-04-08T06:25:06.000000Z",
            "cartdetails": [
                {
                    "id": 1,
                    "products_id": 2,
                    "carts_id": 1,
                    "quantity": 3,
                    "discount": 0,
                    "price": 100000,
                    "subtotal": 300000,
                    "created_at": "2022-04-08T06:25:06.000000Z",
                    "updated_at": "2022-04-08T06:25:06.000000Z"
                }
            ]
        }

and then to this :
 "data": "Shopping cart",
    "itemcart": [
        {
            "id": 1,
            "users_id": 3,
            "no_resi": "oxIkpZ3xhl 001",
            "discount": 0,
            "subtotal": 599091,
            "status": "cart",
            "total": 599091,
            "created_at": "2022-04-08T06:25:06.000000Z",
            "updated_at": "2022-04-08T06:29:22.000000Z",
            "cartdetails": [
                {
                    "id": 1,
                    "products_id": 2,
                    "carts_id": 1,
                    "quantity": 3,
                    "discount": 0,
                    "price": 100000,
                    "subtotal": 300000,
                    "created_at": "2022-04-08T06:25:06.000000Z",
                    "updated_at": "2022-04-08T06:25:06.000000Z"
                },
                {
                    "id": 2,
                    "products_id": 4,
                    "carts_id": 1,
                    "quantity": 3,
                    "discount": 0,
                    "price": 99697,
                    "subtotal": 299091,
                    "created_at": "2022-04-08T06:29:22.000000Z",
                    "updated_at": "2022-04-08T06:29:22.000000Z"
                }
            ]
        },
        {
            "id": 2,
            "users_id": 3,
            "no_resi": "Nf0BkdaxTk 002",
            "discount": 0,
            "subtotal": 0,
            "status": "cart",
            "total": 0,
            "created_at": "2022-04-08T06:29:22.000000Z",
            "updated_at": "2022-04-08T06:29:22.000000Z",
            "cartdetails": []
        }
    ]

问题相同的价值商店，但父母

非常感谢！对于任何人都可以解决我的问题。