Question

保存模型表单时出现了一个奇怪的问题。我有一个表单，它由两个模型表单组成，我试图同时保存它们。为清楚起见，下面是我的代码

Views.py

def create_user(request):
    if request.method == 'POST':
        user_form = UserForm(request.POST)
        my_user_form = MyUsersForm(request.POST)

        if user_form.is_valid() and my_user_form.is_valid():
           us = user_form.save()
           my_us = my_user_form.save(commit=False)
           my_us.user = us
           my_us.save()
           return HttpResponse('You have successfully created a user')
        else:
            return HttpResponse(' My_user_form is not validated')

    else:
         user_form = UserForm()
         my_user_form = MyUsersForm(user=request.user)
         return render(request, 'create_user.html', {'user_form': user_form, 'my_user_form': my_user_form})

当我覆盖MyUsersForm的 init 方法来过滤外键的查询集（created_by）时，我没有验证my_user_form，但是当我不过滤查询集时，my_user_form被验证并且表单是保存。

我不明白的是，当我不过滤查询集时，my_user_form的验证方式是什么？

通过request.post发送到my_user_form的数据以某种方式丢失（当我过滤查询集时）。我们非常感谢任何正确方向的线索。感谢您的宝贵意见。

Forms.py

class MyUsersForm(ModelForm):

    class Meta:
        model = MyUsers
        fields = ['created_by', ]

    def __init__(self, user=None, **kwargs):
        super(MyUsersForm, self).__init__(**kwargs)
        if user is not None:
            self.fields['created_by'].queryset = User.objects.filter(username=user)

的 Models.py

class MyUsers(models.Model):
    user = models.OneToOneField(User, blank=True, null=True)
    created_by = models.ForeignKey(User, related_name="created_by", blank=True, null=True)

Answer 1

def create_user(request):
    if request.method == 'POST':
        user_form = UserForm(request.POST)
        my_user_form = MyUsersForm(request.POST)

        if user_form.is_valid() and my_user_form.is_valid() and User.objects.filter(username=request.POST.get('user')).exists():
           us = user_form.save()
           my_us = my_user_form.save(commit=False)
           my_us.user = us
           my_us.save()
           return HttpResponse('You have successfully created a user')
        else:
            return HttpResponse(' My_user_form is not validated')

    else:
         user_form = UserForm()
         my_user_form = MyUsersForm(user=request.user)
         return render(request, 'create_user.html', {'user_form': user_form, 'my_user_form': my_user_form})

Answer 2

为什么my_user_form未经过验证和保存。我没有修改 init 中的查询集，而是使用语句

在视图中自行完成

my_user_form.fields['created_by'] = forms.ModelChoiceField(User.objects.filter(username=request.user))

这解决了我的问题。但我仍然不知道它为什么不能在MyUsersForm的init方法中工作？

在Modelform中对Foreignkey进行Queryset过滤

2 个答案: