Python 使Form和ModelForm都可以从FormMixin继承字段

我有一个

LocationMixin

，它在表单中添加了一个位置选择器，如下所示

class LocationMixin(object):
    location_required = False
    location_label = u'location'
    location_text = forms.CharField(label=u'location', required=False, \
                                    widget=forms.TextInput(attrs={
                                        'class': 'city_input  inputFocus proCityQueryAll proCitySelAll',
                                        'autocomplete': 'off',
                                        'readonly': 'readonly',
                                    }))

    def __init__(self, *args, **kwargs):
        super(LocationMixin, self).__init__(*args, **kwargs)
        if 'location' not in self.fields:
            raise Exception('LocationMixin need form contain field named location !')
        self.fields['location_text'].required = self.location_required
        self.fields['location_text'].label = self.location_label



class ActivateProfileForm(LocationMixin, forms.ModelForm):

    location_required = True

    class Meta:
        model = Member
        fields = ['address', 'car_type', 'car_no', 'location', 'city']
        widgets = {
            'location': HiddenInput(),
            'city': HiddenInput(),
        }

但这条线会被打破：`

self.fields['location\u text'].required=self.location\u required

Django抱怨

location\u text

在

self.fields

中不存在：

Traceback (most recent call last):
  File "E:\Python27\lib\site-packages\django\core\handlers\base.py", line 112, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "D:\Incubations\Project\xxx\src\xxx\decorator.py", line 54, in wrapper
    return func(request, *args, **kwargs)
  File "D:\Incubations\Project\xxx\src\xxx\views_member.py", line 166, in activate_profile
    form = ActivateProfileForm(instance=member)
  File "D:\Incubations\Project\xxx\src\location_selector\forms.py", line 25, in __init__
    self.fields['location_text'].required = self.location_required
KeyError: 'location_text'

我必须将

classlocationmixin（object）：

更改为

classlocationmixin（forms.ModelForm）：

以使其工作，而

classlocationmixin（forms.BaseForm）

无法工作。

问题是：

---

我还希望

LocationMixin

与

类SomeForm（LocationMixin，forms.Form）

您的LocationMixin现在不是真正的Django表单。尝试从

表单继承。表单

而不是对象

此外，根据您的目标，您可能需要颠倒主类定义的顺序。这：

class ActivateProfileForm(LocationMixin, forms.ModelForm):

不同于：

class ActivateProfileForm(forms.ModelForm, LocationMixin):

---

请提供完整的回溯？