Transform Operation are manage by proper tranform functions, django-adminactions come with a small set but it’s possible to add extra function. Transform function are function that accept one or two parameter.
Please see the changelog
To customize the Form used by the massupdate action simply create your own Form class and set it as value
mass_update_form attribute to your
class MyMassUpdateForm(ModelForm): class Meta: model = MyModel class MyModelAdmin(admin.ModelAdmin): mass_update_form = MyMassUpdateForm admin.register(MyModel, MyModelAdmin)