將驗證添加到導致元類沖突的Django Inlineformset

Question

我正在嘗試向我的Django表單添加驗證。

我想要至少一個子模型用於我的inlineformset。

我將以下內容用作參考： Django中的內聯表單驗證

我仍然遇到錯誤

線454，在formset_factory返回類型（表格名 + STR（“表單集”），（表單集，），ATTRS。）類型錯誤：元類沖突：一個派生類的元類必須的元類的一個（非嚴格）的子類所有基地

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)

我也試圖理解這里解釋的繼承問題： 三重繼承會導致元類沖突...有時

我的視圖邏輯來自https://medium.com/@adandan01/django-inline-formsets-example-mybook-420cc4b6225d

但是我看不到我有一個類繼承自兩個類，這會導致此錯誤。 如果我刪除“ formset ='CustomUnitFormset'，“，一切正常

有人可以解釋錯誤的原因，以及如何防止這種情況嗎？ 我可以更好地管理forms.py文件嗎？

Answer 1

您需要將實際的表單集類而不是字符串傳遞給工廠。

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