How does one use a custom widget with a generic UpdateView without having to redefine the entire form?

Question

I have a model with a ManyToMany relation that I would like to update with a CheckBoxSelectMultiple widget while everything else uses the default generic form, but when I redefi

Answer 1

Here's a mixin that allows you to define a widgets dictionary and still respects the fields list:

from django.forms.models import modelform_factory

class ModelFormWidgetMixin(object):
    def get_form_class(self):
        return modelform_factory(self.model, fields=self.fields, widgets=self.widgets)

It can be used with CreateView, UpdateView, etc. For example:

class KundleUpdate(ModelFormWidgetMixin, UpdateView):
    model = Kunde
    widgets = {
        'unternehmenstyp': CheckboxSelectMultiple,
    }