如何覆盖单元测试目的的时间戳字段？ [英] How to override a timestamp field for unit test purposes?

问题描述

class Record(ndb.Model):
    notes = ndb.TextProperty()
    last_updated = ndb.DateTimeProperty(auto_now=True)

部分单元测试设置：

Part of Unit Test setup:

record2 = Record()    
# trying to set the last_updated timestamp to a previous date
record2.last_updated = previous_date

record2.put()
#after saving it, the timestamp is back to today's date

因此，我无法模拟旧记录为我的单元测试。

Hence I can't emulate an old record for my unit testing. How do I override that field without having to change the model?

推荐答案

从 $ b

From the docs

可以使用 auto_now_add = True 来覆盖某个属性的值，但不能为 auto_now = True 。直到写入实体才会生成自动值;也就是说，这些选项不提供动态默认值。 （这些细节与旧的db API不同。）

It is possible to override the value for a property with auto_now_add=True, but not for one with auto_now=True. The automatic value is not generated until the entity is written; that is, these options don't provide dynamic defaults. (These details differ from the old db API.)

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