How to force-save an “empty”/unchanged django admin inline?

Question

I have some inlines in one of my admin models which have default values which likely won\'t need to be changed when adding a new instance with "Add another ...". U

Answer 1

Combined @Daniels, @HardQuestions' and @jonespm answers:

class MarkNewInstancesAsChangedModelForm(forms.ModelForm):
    def has_changed(self):
        """Returns True for new instances, calls super() for ones that exist in db.
        Prevents forms with defaults being recognized as empty/unchanged."""
        return not self.instance.pk or super().has_changed()