有没有办法在 Django 中保存或更新对象之前对其进行操作？
根据 this 最近的问题，我需要将所有 datetime 对象存储在 UTC 中，所以我需要使用自定义库在存储它们之前正确翻译它们。有没有办法可以对即将保存和/或更新的对象进行操作，以便将 datetime 对象转换为 UTC？我希望这对我如何使用 Django 非常透明，所以如果它是这些类型的字段中的任何一种：
created = models.DateTimeField(auto_now_add=True)
modified = models.DateTimeField(auto_now=True)
event_time = models.DateTimeField()
...我想将它们翻译为“幕后”，可以这么说，以免手动执行以下操作：
new_instance.created = translate(now)
new_instance.modified = translate(now)
new_instance.event_time = translate(event_time)
在所有 DateTimeField 字段上手动执行此操作很快就会变得非常麻烦。 Django 有办法做到这一点吗？在 Hibernate 中，我会使用 AOP 或拦截器来执行此操作。
As per this recent question, I'll be needing to store all datetime objects in UTC, so I'll need to use a custom library to translate them properly before they're stored. Is there a way I can act on objects which are about to be saved and/or updated in order to convert the datetime objects to UTC? I'd like this to be pretty transparent to how I use Django, so if it's any one of these types of fields:
created = models.DateTimeField(auto_now_add=True)
modified = models.DateTimeField(auto_now=True)
event_time = models.DateTimeField()
...I'd like to translate them 'behind the scenes' so to speak, so as to not have to manually do the following:
new_instance.created = translate(now)
new_instance.modified = translate(now)
new_instance.event_time = translate(event_time)
It'd get pretty cumbersome pretty quickly to manually do this on all DateTimeField fields. Is there a way in Django to do this? In Hibernate, I'd either use AOP or an Interceptor to do this.
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设置 TIME_ZONE 怎么样？
要回答标题上的问题，您可以覆盖模型上的保存方法：
如果您想通知其他人某些事件（例如保存前和保存后），请使用 django 信号
how about setting the TIME_ZONE?
To answer the question on the title, you can override the save method on your model:
If you want to inform others about certain events (like pre-save and post-save), use django signals
看看信号： https://docs.djangoproject.com/en/1.3/主题/信号/
Have a look at Signals: https://docs.djangoproject.com/en/1.3/topics/signals/
嗯，如果我理解正确的话，我认为一个好的方法是创建一个自定义
DateTimeField。为此，您应该子类化DateTimeField并重写一些方法（to_python、pre_save 等，这取决于您的具体需求）。有关更多信息，请查看文档。
Hmm, if I understand you correctly, I think a good way to go will be to create a custom
DateTimeField. For that you should subclassDateTimeFieldand override a few methods (to_python, pre_save, etc., it depends of your specific needs).Check the documentation for more info.