def METHOD_NAME(self, new_data):
    result = ""
    for field in self.model._meta.fields:
        field = field.name
        if (
            field in new_data
            and self._values_before_update[field] != new_data[field]
        ):
            _before_update = self._values_before_update[field]
            _after_update = new_data[field]
            result += f"{field.title()}: {_before_update} -> {_after_update}\n"
    if result:
        add_comment([self.object], result, self.request.user)