问题

I'm trying to play nice with TimeZones in Rails.

我正在尝试在Rails中与时区合作。

I have a model called Event which has the datetime field starts_at and string field timezone.

我有一个名为Event的模型，其中包含了starts_at日期时间字段和timezone字符串字段。

I'm however just a bit confused as to the best practice for managing these dates as I am working with the date of these Events which are quite different from the application's timezone.

然而，我对于如何管理这些日期的最佳实践有些困惑，因为我正在处理与应用程序时区非常不同的这些事件的日期。

By default rails is using the timezone of my application which is CEST and so by default when I save a date for an Event it uses this timezone.

默认情况下，Rails使用我的应用程序的时区，即CEST，因此默认情况下，当我保存事件的日期时，它使用这个时区。

However 99% of the time we think of the date in terms of the client for whom we set the timezone on the model.

然而，99%的情况下，我们是根据客户的时区来考虑日期的。

So the default of setting it in our timezone is not great.

因此，将其设置为我们的时区的默认设置不是很好。

Should I:

我应该：

1. Keep setting these dates relative to my time, eg starts_at set in CEST and interpret them into the client time, eg client_starts_at. However this is confusing since, we usually input starts_at relative to the client's time and not to our own.

2. 继续相对于我的时间设置这些日期，例如，将starts_at设置为CEST并将其解释为客户的时间，例如，client_starts_at。但是这很令人困惑，因为通常我们是根据客户的时间输入starts_at，而不是根据我们自己的时间。

3. Do some kind of getter/setter to be able to input dates as the users time. Which avoids most of the issue as all things go into UTC anyway.

4. 进行某种类型的getter/setter操作，以便能够按用户的时间输入日期。这可以避免大部分问题，因为所有的事情最终都会转换为UTC。

5. Configure the model or controller to take into account the timezone field of the Event and thereby set every record starts_at into the correct timezone and then interpret the time zone for us into local_starts_at.

6. 配置模型或控制器以考虑Event的timezone字段，并因此将每个记录的starts_at设置为正确的时区，然后为我们解释成local_starts_at。

7. Perhaps i'd be better off separating starts_at into two fields separating date from time?

8. 也许我最好将starts_at分成两个字段，分别是date和time？

The option 3 or 4 seem better but does anyone know of a resource as this would seem to be a very common problem.

选项3或4似乎更好，但是否有人知道有关此问题的资源，因为这似乎是一个非常常见的问题。

Also I'm not sure if I should be managing these issues on the model level or dealing with it in the controller.

而且我不确定是否应该在模型级别管理这些问题，还是在控制器中处理它。

Thanks,

谢谢，

https://thoughtbot.com/blog/its-about-time-zones

https://thoughtbot.com/blog/its-about-time-zones

答案1

得分: 1

你可以使用 in_time_zone。

def client_starts_at
  starts_at.in_time_zone(timezone)
end

无论它是如何存储的，你都会得到正确的时区。

你甚至可以重写基础方法（不推荐）：

def starts_at
  read_attribute(:starts_at).in_time_zone(timezone)
end

def client_starts_at
  starts_at.in_time_zone(timezone)
end

def starts_at
  read_attribute(:starts_at).in_time_zone(timezone)
end