Python django.forms.models 模块，BaseModelFormSet() 实例源码

def formset_class(self):
        formset_class = inlineformset_factory(
            RealTransaction, VirtualTransaction, form=VirtualTransactionForm,
            formset=BaseModelFormSet, can_delete=True, extra=0,
        )
        return formset_class

def formset(self):
        formset_class = inlineformset_factory(
            Submission, Resource, form=ResourceForm, formset=BaseModelFormSet,
            can_delete=True, extra=0,
        )
        obj = self.get_object()
        return formset_class(
            self.request.POST if self.request.method == 'POST' else None,
            files=self.request.FILES if self.request.method == 'POST' else None,
            queryset=obj.resources.all() if obj else Resource.objects.none(),
            prefix='resource',
        )

def validate_formset(self, cls, model):
        " Validate formset is a subclass of BaseModelFormSet. "
        if hasattr(cls, 'formset') and not issubclass(cls.formset, BaseModelFormSet):
            raise ImproperlyConfigured("'%s.formset' does not inherit from "
                    "BaseModelFormSet." % cls.__name__)