Django default = timezone.now（）使用“旧”保存记录时间 [英] Django default=timezone.now() saves records using "old" time

问题描述

这个问题已经在几个星期内出现了，而且与我的项目没有任何关系。

使用的两个模型都有一个时间戳记字段，默认情况下设置为 timezone.now（）。

这是引发错误标志的顺序：

---

• 模型一是在下午7:30时创建




• 模型二是在下午10点建立的，但在
  MySQL数据库中存储为7:30 PM！

创建的每个模型
的时间戳都保存在下午7:30，而不是实际时间，直到某个
持续时间过去。然后设置一个新的时间，所有以下模型
有新的时间... Bizzare

---

一些额外的细节可能有助于发现问题：

我有一些方法，我用来剥离我们的时区他们的 tzinfo 并将其替换为UTC。

这是因为我正在做一个 timezone.now（） - creationTime 计算来创建一个：模型很久以前就发布了功能
在项目中。但是，这真的不应该是问题的原因。

我不认为使用 datetime.datetime.now（）

解决方案

刚刚在上个星期遇到了一个有 default = date.today（）的字段。如果你删除括号（在这种情况下，尝试 default = timezone.now ）然后你传递一个可调用的模型，它将被调用每次一个新的实例被保存。使用括号，当 models.py 加载时，它只会被调用一次。

This issue has been occurring on and off for a few weeks now, and it's unlike any that has come up with my project.

Two of the models that are used have a timestamp field, which is by default set to timezone.now().

This is the sequence that raises error flags:

---

• Model one is created at time 7:30 PM

• Model two is created at time 10:00 PM, but in the MySQL database it's stored as 7:30 PM!

Every model that is created has its time stamp saved under 7:30 PM, not the actual time, until a certain duration passes. Then a new time is set and all the following models have that new time... Bizzare

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Some extra details which may help in discovering the issue:

I have a bunch of methods that I use to strip my timezones of their tzinfo's and replace them with UTC.

This is because I'm doing a timezone.now() - creationTime calculation to create a: "model was posted this long ago" feature in the project. However, this really should not be the cause of the problem.

I don't think using datetime.datetime.now() will make any difference either.

Anyway, thanks for the help!

解决方案

Just ran into this last week for a field that had default=date.today(). If you remove the parentheses (in this case, try default=timezone.now) then you're passing a callable to the model and it will be called each time a new instance is saved. With the parentheses, it's only being called once when models.py loads.

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