Using a mixin with a Django form class

Question

I\'m thinking about creating a mixin form class so that I can add a common set of fields to a variety of otherwise very different forms. Just using it as a base class won\'t

Answer 1

class TextFormMixin(object):
    def __init__(self, *args, **kwargs):
        super(TextFormMixin, self).__init__(*args, **kwargs)
        self.fields['text'] = forms.CharField(widget=forms.Textarea, required=True)

    def clean_text(self):
        if not ('{{EMAIL}}' in self.cleaned_data.get('text', '')):
            raise ValidationError("You have to put {{EMAIL}} in message body.")
        return self.cleaned_data.get('text', '')

    def get_text(self):
        return self.cleaned_dat['text'].replace('{{EMAIL}}', self.case.get_email())


class NewCaseForm(TextFormMixin, forms.ModelForm):
    pass
class ReplyForm(TextFormMixin, forms.Form):
    to = forms.CharField(max_length=50)
    subject = forms.CharField(max_length=50)