如何在 MongoMapper 中将日期转换为 UTC红宝石/导轨？

发布于 2024-10-14 19:02:51 字数 271 浏览 8 评论 0原文

我添加了这行代码

self.auth_history.push [start_date, self.coupon_code]

并收到此错误消息

Date is not currently supported; use a UTC Time instance instead.

我也尝试了 start_date.utc，但它也不起作用。

请帮忙。谢谢。

原文

I added this line of code

self.auth_history.push [start_date, self.coupon_code]

And got this error message

Date is not currently supported; use a UTC Time instance instead.

I also tried start_date.utc, but it didn't work either.

Please help. Thanks.

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入画浅相思 2024-10-21 19:02:51

我从西雅图旅组得到了这个答案 -

===

我没有看到你的代码中定义的 start_date 作为 MongoMapper 中的键，所以
我假设您正在创建自己的日期对象，或者直接通过 Ruby，
或由 Rails 包裹。据我所知，请有人纠正我，Mongo
将日期存储为 UTC 时间（自纪元以来的毫秒数）。所以当你定义一个
在 MongoMapper 中使用 :date 映射键，您将 Time 对象包装在
红宝石。

因此，如果你想在 Mongo 中存储日期，但事实并非如此
由 MongoMapper 创建，请确保您创建 UTC 时间对象。
MongoMapper 附带了一个名为 to_mongo 的 Date mixin 方法，您可以使用它。

>> Time.now.utc
=> Fri Jan 28 03:47:50 UTC 2011
>> require 'date'
=> true
>> date = Date.today
=> #<Date: 4911179/2,0,2299161>
>> Time.utc(date.year, date.month, date.day)
=> Thu Jan 27 00:00:00 UTC 2011
>> require 'rubygems'
=> true
>> require 'mongo_mapper'
=> true
>> Date.to_mongo(date)
=> Thu Jan 27 00:00:00 UTC 2011

但要注意时间变化。

>> Date.to_mongo(Time.now)
=> Thu Jan 27 00:00:00 UTC 2011
>> Date.to_mongo(Time.now.utc)
=> Fri Jan 28 00:00:00 UTC 2011

祝你好运。

===

通过使用

Date.to_mongo(start_date)

它对我有用。

I got this answer from Seattle Brigade group -

===

I didn't see start_date defined in your code as a key in MongoMapper, so
I'll assume you're creating your own date object, either directly via Ruby,
or wrapped by Rails. As far as I know, and someone please correct me, Mongo
stores dates as UTC time in milliseconds since epoch. So when you define a
key with a :date mapping in MongoMapper, you're wrapping a Time object in
Ruby.

Therefore, if you want to store a date inside of Mongo, and it wasn't
created by MongoMapper, make sure you create a Time object in UTC.
MongoMapper comes with a Date mixin method called to_mongo that you can use.

>> Time.now.utc
=> Fri Jan 28 03:47:50 UTC 2011
>> require 'date'
=> true
>> date = Date.today
=> #<Date: 4911179/2,0,2299161>
>> Time.utc(date.year, date.month, date.day)
=> Thu Jan 27 00:00:00 UTC 2011
>> require 'rubygems'
=> true
>> require 'mongo_mapper'
=> true
>> Date.to_mongo(date)
=> Thu Jan 27 00:00:00 UTC 2011

But watch out for the time change.

>> Date.to_mongo(Time.now)
=> Thu Jan 27 00:00:00 UTC 2011
>> Date.to_mongo(Time.now.utc)
=> Fri Jan 28 00:00:00 UTC 2011

Good luck.

===

And by using

Date.to_mongo(start_date)

it works for me.

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停滞 2024-10-21 19:02:51

首先，我认为问题标题的描述不好。实际上，不同时区之间的差异在于时间而不是日期。所以，说我想将日期转换为 UTC 格式确实不合适。

这是 Ruby 中将 DateTime 转换为其 UTC 格式的另一种方法：

DateTime.now.new_offset(0)

First, I think the question title is bad in description. Actually, the difference between different timezone is on Time not on Date. So, it's really not proper to say I want to convert a date to UTC format.

Here is another way in Ruby to convert DateTime to its UTC format:

DateTime.now.new_offset(0)

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演出会有结束 2024-10-21 19:02:51

这是另一个选项：

Time.at(Date.today.to_datetime.to_i).utc

这里我使用 Date.today 作为任意示例日期。替换为您要转换的任何日期。一旦日期转换为 Time 实例，它就可以毫无问题地序列化为 BSON，因为 Time 是受支持的原始类型，即也就是说可以使用MongoMapper保存到数据库中。

Here's another option:

Time.at(Date.today.to_datetime.to_i).utc

Here I am using Date.today as an arbitrary example date. Replace with whatever date you want to convert. Once the date is converted to a Time instance, it can be serialized to BSON without any problem, as Time is a supported primitive type, that is to say, it can be saved using MongoMapper to the database.

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