Django，檢查查詢集是否為空的條件

Question

我想檢查項目查詢集是否為空。

order = Order.objects.get(customer=request.user.customer , complete=False)
items = order.orderitem_set.all()
flag = True
if items == None:
    flag = False

Answer 1

您可以使用.exists() [Django-doc]進行檢查：

order = Order.objects.get(customer=request.user.customer, complete=False)
flag = order.orderitem_set.exists()  # True if  one item