Ruby-on-rails ActiveRecord 日期格式
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ActiveRecord date format
提问by Mongus Pong
I've run into a spot of bother with date formats in our Rails application.
我在 Rails 应用程序中遇到了日期格式的麻烦。
I have a date field in our view which I want to be formatted as dd/mm/yy. This is how the user will expect to enter their dates, and the datepicker control uses this format.
我的视图中有一个日期字段，我想将其格式化为dd/mm/yy。这是用户期望输入日期的方式，日期选择器控件使用这种格式。
However, Active Record seems to be expecting mm/dd/yy.
但是，Active Record 似乎期待mm/dd/yy。
If I enter 01/03/2010, this gets put in as 03 January 2010.
如果我输入01/03/2010，则会将其输入为03 January 2010。
If I enter 25/03/2010, this gets put in a null.
如果我输入25/03/2010，则会将其放入null。
How do I get ActiveRecord to expect Her Majesties date format?
我如何让 ActiveRecord 期待女王陛下的日期格式？
回答by Marcel Hymanwerth
Rails' DateTime tries to detect the formatting automatically. It will detect the following formats: mm/dd/yyor dd-mm-yyor yyyy-mm-ddor yyyy/mm/dd. You could monkey-patch DateTime.parse, but I would rather move this issue to the Viewof your application.
Rails 的 DateTime 尝试自动检测格式。它将检测以下格式：mm/dd/yyordd-mm-yy或yyyy-mm-ddor yyyy/mm/dd。您可以使用 monkey-patch DateTime.parse，但我宁愿将此问题移至您的应用程序的视图。
I always recommend to use yyyy-mm-dd [hh:mm:ss]as a string representation for a date. Check the documentation of your DatePicker if it supports multiple date-formats.
我总是建议使用yyyy-mm-dd [hh:mm:ss]作为日期的字符串表示。如果它支持多种日期格式，请检查您的 DatePicker 的文档。
The jQuery date-picker for example has this covered with dateFormat(for the data that is sent to the server, set this to yyyy-mm-dd) as well as altFormat(for the input the user sees, set this to dd/mm/yyyy).
例如，jQuery 日期选择器包含dateFormat（对于发送到服务器的数据，将其设置为yyyy-mm-dd）以及altFormat（对于用户看到的输入，将其设置为dd/mm/yyyy）。
回答by Harish Shetty
Add a file called rails_defaults.rbto config\initializersdirectory; with following lines:
添加一个名为rails_defaults.rb到config\initializers目录; 有以下几行：
Date::DATE_FORMATS[:default] = '%d/%m/%Y'
Time::DATE_FORMATS[:default]= '%d/%m/%Y %H:%M:%S'
Restart the server and you are good to go.
重新启动服务器，您就可以开始了。
回答by grosser
class Date
class << self
def _parse_with_us_format(date, *args)
if date =~ %r{^(\d+)/(\d+)/(\d+)$}
_parse_without_us_format("#{.length == 2 ? "20#{}" : }-#{}-#{}", *args)
else
_parse_without_us_format(date, *args)
end
end
alias_method_chain :_parse, :us_format
end
end
