python - Django 在 Save() 之后立即更新表

Question

我正在尝试将订单信息插入两个表 Order和User

我可以保存两个表的值，但在尝试更新 Order 时出现错误表 User ID来自刚刚在 User 中创建的记录表。

错误:

Cannot assign "54L":"Order.user" must be a "User" instance.

view.py

if request.method == 'POST':
    form = OrderForm(request.POST)
    userform = UserForm(request.POST)

        if form.is_valid():

            #save both tables
            userform.save()
            form.save()

            #get user ID 
            user_info = User.objects.filter(email=request.POST['email']).order_by('-id')[0]

            #update order with user ID
            u = Order.objects.filter().order_by('-id')[0]
            u.user = user_info.id
            u.save()

            return HttpResponseRedirect('/success/')
else:
    form = OrderForm()
    ...

Answer 1

将 u.user = user_info.id 更改为 u.user = user_info