Question

我有一个LocationMixin，它为表单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(),
        }

但它会在这一行被打破：`

self.fields [＆＃39; location_text＆＃39;] .require = self.location_required

Django抱怨location_text中不存在self.fields：

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class LocationMixin(object):更改为class LocationMixin(forms.ModelForm):才能使其正常工作，class LocationMixin(forms.BaseForm)无法正常工作。

问题是：
我还希望LocationMixin与class SomeForm(LocationMixin, forms.Form)一起使用。

Answer 1

您的LocationMixin现在不是真正的Django表单。尝试继承forms.Form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。这样：

class ActivateProfileForm(LocationMixin, forms.ModelForm):

不同于：

class ActivateProfileForm(forms.ModelForm, LocationMixin):

使Form和ModelForm都可以从FormMixin继承字段

1 个答案: