announcement model.py 里面增加一个新的字段(最后更新时间)
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@@ -13,6 +13,8 @@ class Announcement(models.Model):
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create_time = models.DateTimeField(auto_now_add=True)
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# 这个公告是谁创建的
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created_by = models.ForeignKey(User)
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# 最后更新时间
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last_update_time = models.DateTimeField(auto_now=True)
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# 是否可见 false的话相当于删除
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visible = models.BooleanField(default=True)
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