訂單對象未在收集的地圖功能中定義

Question

我有2個表格用於放置我的訂單。在我的orders表中，我包含訂單的主要細節，在我的order_item表中，我詳細列出了每個訂購的項目。這是我爲同一代碼：

$order = new Order(); 
    $order->user_id = $user->id; 
    if(!$order->save()){ 
     return response()->json([ 
      'message' => 'Unable to place your order. Try again.' 
     ], 500); 
    } 

    $items = Cart_Item::where('user_id', $user->id)->get(); 
    if($items->isEmpty()){ 
     return response()->json([ 
      'message' => 'Kindly add items to the cart before placing an order.' 
     ], 500); 
    } 
    $items = $items->map(function ($item, $key) { 
     $product = Product::where('id', $item->product_id)->first(); 
     $order_item = new Order_Item(); 
     $order_item->order_id = $order->id; 
     $order_item->product_id = $item->product_id; 
     $order_item->quantity = $item->quantity; 
     $order_item->price = $product->GetPrice->price; 
     if(!$order_item->save()){ 
      return response()->json([ 
       'message' => 'Unable to place your order. Try again.' 
      ], 500); 
     } 
    }); 

當我嘗試執行此，我上線$order_item->order_id = $order->id;得到這個錯誤Undefined variable: order。爲什麼我不能訪問訂單對象？

Answer 1

您必須使用use將變量傳遞給閉包。

$items = $items->map(function ($item, $key) use ($order) { 
    $product = Product::where('id', $item->product_id)->first(); 
    $order_item = new Order_Item(); 
    $order_item->order_id = $order->id; 
    $order_item->product_id = $item->product_id; 
    $order_item->quantity = $item->quantity; 
    $order_item->price = $product->GetPrice->price; 
    if(!$order_item->save()){ 
     return response()->json([ 
      'message' => 'Unable to place your order. Try again.' 
     ], 500); 
    } 
});