[Answered ]-Form mixin for a modelform?

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It’s more complicated than you’d think to achieve this using that approach, because of the way in which Django uses metaclasses. (More details in this answer.)

I’d try overriding the constructor – (and note that the mixin extends from object now):

class MyFormMixin(object):
    def __init__(self, *args, **kwargs):
        super(MyFormMixin, self).__init__(*args, **kwargs)
        self.fields['extra_field_1'] = forms.CharField(required=False)
        self.fields['extra_field_2'] = forms.CharField(required=False)

class ModelFormA(MyFormMixin, forms.ModelForm):
     ...
👤seddonym

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