python - 如何覆盖时间戳字段以进行单元测试？

Question

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

部分单元测试设置:

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

因此我无法模拟单元测试的旧记录。如何在不更改模型的情况下覆盖该字段？

Answer 1

来自 docs

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.)