def update_or_create(self, model, defaults={}, **lookup):
        try:
            post, created = model.objects.get_or_create(defaults=defaults,
                                                        **lookup)
        except model.MultipleObjectsReturned:
            # "safe" in this environment
            return

        if not created:
            fields = dict(defaults).update(lookup)
            [setattr(model, f_name, f_value)
                    for f_name, f_value in fields.items()]
            model.save()