def METHOD_NAME(self):
    """Override that uses the form field's ``save_object_data()``."""
    super().METHOD_NAME()
    for name, field in self.fields.items():
        if not hasattr(field, 'save_object_data'):
            continue
        value = self.cleaned_data.get(name, None)
        if value:
            field.save_object_data(self.instance, name, value)