Python 非类型'；对象没有属性'；型号'；

我的一张表格给了我这个错误，而我似乎无法找出问题所在

11:24:04 web.1  | Internal Server Error: /dash/location/add
11:24:04 web.1  | Traceback (most recent call last):
11:24:04 web.1  |   File "/Library/Python/2.7/site-packages/django/core/handlers/base.py", line 114, in get_response
11:24:04 web.1  |     response = wrapped_callback(request, *callback_args, **callback_kwargs)
11:24:04 web.1  |   File "/Library/Python/2.7/site-packages/django/contrib/auth/decorators.py", line 22, in _wrapped_view
11:24:04 web.1  |     return view_func(request, *args, **kwargs)
11:24:04 web.1  |   File "/Library/Python/2.7/site-packages/django/views/generic/base.py", line 69, in view
11:24:04 web.1  |     return self.dispatch(request, *args, **kwargs)
11:24:04 web.1  |   File "/Library/Python/2.7/site-packages/django/views/generic/base.py", line 87, in dispatch
11:24:04 web.1  |     return handler(request, *args, **kwargs)
11:24:04 web.1  |   File "/Users/nir/dashboard/pinpoint/apps/locationmanager/views.py", line 43, in post
11:24:04 web.1  |     if form.is_valid():
11:24:04 web.1  |   File "/Library/Python/2.7/site-packages/django/forms/forms.py", line 129, in is_valid
11:24:04 web.1  |     return self.is_bound and not bool(self.errors)
11:24:04 web.1  |   File "/Library/Python/2.7/site-packages/django/forms/forms.py", line 121, in errors
11:24:04 web.1  |     self.full_clean()
11:24:04 web.1  |   File "/Library/Python/2.7/site-packages/django/forms/forms.py", line 273, in full_clean
11:24:04 web.1  |     self._clean_fields()
11:24:04 web.1  |   File "/Library/Python/2.7/site-packages/django/forms/forms.py", line 288, in _clean_fields
11:24:04 web.1  |     value = field.clean(value)
11:24:04 web.1  |   File "/Library/Python/2.7/site-packages/django/forms/fields.py", line 148, in clean
11:24:04 web.1  |     value = self.to_python(value)
11:24:04 web.1  |   File "/Library/Python/2.7/site-packages/django/forms/models.py", line 1136, in to_python
11:24:04 web.1  |     except (ValueError, self.queryset.model.DoesNotExist):
11:24:04 web.1  | AttributeError: 'NoneType' object has no attribute 'model'

这是发生错误的视图：

class AddLocation(View):

    template_name = "dash/Addlocation.html"
    form = locationForm()
    def get(self, request, *args, **kwargs):
        user = User.objects.get(username=request.user.username)
        self.form.fields['region_name'].queryset = Region.objects.filter(location__manager=user)
        return render(request, self.template_name, {'form': self.form})

    def post(self, request, *args, **kwargs):
        form = locationForm(request.POST)
        if form.is_valid():
            region_obj, _created = Region.objects.get_or_create(name=form.cleaned_data['region_name'])
            form.cleaned_data['region_name'] = region_obj
            user = User.objects.get(username=request.user.username)
            location = Location(
                region_obj,
                user,name = form.cleaned_data['name'],
                street_address = form.cleaned_data['street_address'],
                city = form.cleaned_data['city'],
                zip_code = form.cleaned_data['zip_code']
            )
            location.save()

            return redirect(reverse('location_manager'))
        else:
            form = locationForm(request.POST)
            return render(request, self.template_name, {'form': form})

具体来说，在尝试验证表单是否有效（）时，似乎出现了问题：

如果需要，我可以发布更多信息，但我真的不知道这个错误是什么意思。有人能解释一下吗

编辑： 这是表格本身

from django import forms


    class locationForm(forms.Form):
        region_name = forms.ModelChoiceField(queryset=None, label="Region Name")
        location_name = forms.CharField()
        street_address = forms.CharField()
        city = forms.CharField()
        zip_code = forms.CharField()

---

您已将区域名称的查询集显式定义为“无”。这是无效的：您需要一个查询集。您确实在视图的

get

方法中正确地分配了查询集，但在post中没有，因此在post上验证表单时，当然会失败

---

与其在视图中这样做，不如在调用

super

locationForm之后，真正重写表单的

\uuuu init\uuuu

方法并在那里分配查询集。locationForm看起来像什么？这里：

user，name=form.cleaned\u data['name'，

您只定义了

name

，而不是

user

，您的

post（）

方法缺少

ELSE

。它只有在时才有一个

。如果if-valid语句失败了怎么办？你真的应该为表单本身提供代码。我已经为Aron Ysidoro添加了基于类的视图的完整代码，你可以看到else在那里，我只提供了一个片段。Zclancy&Daniel Roseman，我已经提供了表格本身。任何帮助都将不胜感激。嗨！几年后，我得到了这个确切的消息，但我正在表单的init方法中设置queryset，正如您所说的那样。另外，表单将按照预期在模板中呈现，并使用queryset中的正确选项。只有在提交表单时才会出现此错误。本地变量也给出了我期望的值。真的不知道是什么触发了这条信息