Multiple Models in a single django ModelForm?

I used django betterforms's MultiForm and MultiModelForm in my project. The code can be improved, though. For example, it's dependent on django.six, which isn't supported by 3.+, but all of these can easily be fixed

This question has appeared several times in StackOverflow, so I think it's time to find a standardized way of coping with this.

You can just show both forms in the template inside of one <form> html element. Then just process the forms separately in the view. You'll still be able to use form.save() and not have to process db loading and saving yourself.

In this case you shouldn't need it, but if you're going to be using forms with the same field names, look into the prefix kwarg for django forms. (I answered a question about it here).

You can try to use this pieces of code:

class CombinedFormBase(forms.Form):
    form_classes = []

    def __init__(self, *args, **kwargs):
        super(CombinedFormBase, self).__init__(*args, **kwargs)
        for f in self.form_classes:
            name = f.__name__.lower()
            setattr(self, name, f(*args, **kwargs))
            form = getattr(self, name)
            self.fields.update(form.fields)
            self.initial.update(form.initial)

    def is_valid(self):
        isValid = True
        for f in self.form_classes:
            name = f.__name__.lower()
            form = getattr(self, name)
            if not form.is_valid():
                isValid = False
        # is_valid will trigger clean method
        # so it should be called after all other forms is_valid are called
        # otherwise clean_data will be empty
        if not super(CombinedFormBase, self).is_valid() :
            isValid = False
        for f in self.form_classes:
            name = f.__name__.lower()
            form = getattr(self, name)
            self.errors.update(form.errors)
        return isValid

    def clean(self):
        cleaned_data = super(CombinedFormBase, self).clean()
        for f in self.form_classes:
            name = f.__name__.lower()
            form = getattr(self, name)
            cleaned_data.update(form.cleaned_data)
        return cleaned_data

Example Usage:

class ConsumerRegistrationForm(CombinedFormBase):
    form_classes = [RegistrationForm, ConsumerProfileForm]

class RegisterView(FormView):
    template_name = "register.html"
    form_class = ConsumerRegistrationForm

    def form_valid(self, form):
        # some actions...
        return redirect(self.get_success_url())