AttributeError：“ NoneType”对象没有属性“ history_change_reason”

Question

我正在使用django-simple-history保存django模型中每个更改的更改历史记录。

我尝试过的：

class MyModel(models.models):
    field1 = ...
    ...
    history = HistoricalRecords(
        history_change_reason_field=models.TextField(null=True)
    )


name = 'xyz'
for doc_id, status in my_data:
    reporting , _ = MyModel.objects.get_or_create(
        doc_id=doc_id,
        user=self.request.user
    )
    reporting.is_accepted = status
    reporting.save(
        update_fields=['is_accepted']
    )
    update_change_reason(
        instance=reporting,
        reason=f'Change request done by {name}'
    )

，我得到以下错误。 AttributeError: 'NoneType' object has no attribute 'history_change_reason'