Question

我正在尝试为我的Django表单添加验证。

我想要为我的inlineformset至少要一个子模型。

我使用以下作为参考： Inline Form Validation in Django

我仍然收到错误

第454行，在formset_factory中返回类型（表单。名称 + str（＆＃39; FormSet＆＃39;），（formset，），attrs）TypeError：元类冲突：派生类的元类必须是所有基础的元类的（非严格的）子类

from django.forms import inlineformset_factory
from .models import *
from django.forms.models import BaseInlineFormSet
from django import forms
class PropertyForm(forms.ModelForm):
    class Meta:
        model = Property
        exclude = ()


class UnitForm(forms.ModelForm):
    class Meta:
        model = Unit
        exclude = ()

class CustomUnitFormset(BaseInlineFormSet):
    def is_valid(self):
        return super(CustomUnitFormset, self).is_valid() and \
               not any([bool(e) for e in self.errors])

    def clean(self):
        # get forms that actually have valid data
        count = 0
        for form in self.forms:
            try:
                if form.cleaned_data and not form.cleaned_data.get('DELETE', False):
                    count += 1
            except AttributeError:
                pass
        if count < 1:
            raise forms.ValidationError('You must have at least one unit')

UnitFormSet = inlineformset_factory(Property, Unit, form=PropertyForm,
                                    formset='CustomUnitFormset',
                                    extra=0,
                                    min_num=1,
                                    validate_min=True,
                                    validate_max=True,
                                    max_num=10,
                                    )

view.py

 class PropertyUnitCreate(LoginRequiredMixin, CreateView):
    model = Property
    fields = ['address']
    success_url = reverse_lazy('property-list')

    def get_context_data(self, **kwargs):
        data = super(PropertyUnitCreate, self).get_context_data(**kwargs)
        if self.request.POST:
            data['units'] = UnitFormSet(self.request.POST)
        else:
            data['units'] = UnitFormSet()
        return data

    def form_valid(self, form):
        context = self.get_context_data()
        units = context['units']
        form.instance.user = self.request.user
        with transaction.atomic():
            self.object = form.save()
            if units.is_valid():
                units.instance = self.object
                units.save()


        return super(PropertyUnitCreate, self).form_valid(form)

我也尝试了解这里解释的继承问题：Triple inheritance causes metaclass conflict... Sometimes

我的观点逻辑来自https://medium.com/@adandan01/django-inline-formsets-example-mybook-420cc4b6225d

但我不知道我从哪个类继承了两个会导致此错误的类。如果我删除＆＃34;表单集=＆＃39; CustomUnitFormset＆＃39 ;, ＆＃34;

有人可以解释错误的原因以及我如何防止这种情况？我可以更好地管理我的forms.py文件吗？

Answer 1

您需要将实际的formset类（而不是字符串）传递给工厂。

UnitFormSet = inlineformset_factory(Property, Unit, form=PropertyForm,
                                    formset=CustomUnitFormset, ...)

向Django Inlineformset添加验证导致Metaclass冲突

1 个答案: