我正在为电子商务应用程序构建一个API

现在，我陷入了创建秩序的困境

我有以下迁移

订单

        Schema::create('orders', function (Blueprint $table) {
        $table->id();
        $table->string('order_number');
        $table->unsignedBigInteger('user_id');
        $table->enum('status', ['pending','processing','completed','decline'])->default('pending');
        $table->float('grand_total');
        $table->integer('item_count');
        $table->boolean('is_paid')->default(false);
        $table->enum('payment_method', ['cash_on_delivery'])->default('cash_on_delivery');
        $table->string('notes')->nullable();

        $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
        $table->timestamps();
    });

order_items

        Schema::create('order_items', function (Blueprint $table) {
        $table->id();
        $table->unsignedBigInteger('order_id');
        $table->unsignedBigInteger('product_id');

        $table->foreign('product_id')->references('id')->on('products')->onDelete('cascade');
        $table->foreign('order_id')->references('id')->on('orders')->onDelete('cascade');

        $table->float('price');
        $table->integer('quantity');

        $table->timestamps();
    });

产品

Schema::create('products', function (Blueprint $table) {
        $table->increments('id');
        $table->string('img');
        $table->string('name');
        $table->string('desc');
        $table->integer('price');
        $table->timestamps();
    });

这是模特的关系

订单模型

public function items()
{
    return $this->belongsToMany(Medicine::class, 'order_item','order_id','product_id')->withPivot('quantity','price');
}

public function user()
{
    return $this->belongsTo(User::class);
}

控制器

    public function store(Request $request)
{

    $order = new Order();
    $order->order_number = uniqid('ORD.');
    $order->user_id = 1;
    $order->item_count = 2;
    $order->grand_total = 20;
    $order->save();

    return response(['message'=>'successful']);
}

现在，我可以成功添加订单了。

但是如何从JSON请求中添加项

例如，通过从Postman发布JSON数据

有什么想法吗？