Django的更新表后立即保存（）

Question

我试图插入订单信息到两个表Order和User

我可以保存值两个表，但得到一个错误试图与更新Order表时来自User表中刚创建的记录。

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

变化u.user = user_info.id到u.user = USER_INFO