我已经有这个问题好几天了,找不到任何解决方案。我似乎无法更改Mongoid文档中字段的Date(&DateTime)格式
class Project
include Mongoid::Document
field :deadline, :type => Date
end
然后我可以这样分配日期:
p = Project.new
p.deadline = "20-10-2011"
但我不能以其他格式分配:
p.deadline = "20/10/2011"
ArgumentError: invalid date
from /Users/pww/.rvm/rubies/ree-1.8.7-2011.03/lib/ruby/1.8/date.rb:956:in `new_by_frags'
from /Users/pww/.rvm/rubies/ree-1.8.7-2011.03/lib/ruby/1.8/date.rb:1000:in `parse'
from /Users/pww/.rvm/gems/ree-1.8.7-2011.03@v3/gems/mongoid-2.0.2/lib/mongoid/extensions/date/conversions.rb:18:in `convert_to_time'
from /Users/pww/.rvm/gems/ree-1.8.7-2011.03@v3/gems/mongoid-2.0.2/lib/mongoid/extensions/time_conversions.rb:6:in `set'
from /Users/pww/.rvm/gems/ree-1.8.7-2011.03@v3/gems/mongoid-2.0.2/lib/mongoid/field.rb:109:in `set'
from /Users/pww/.rvm/gems/ree-1.8.7-2011.03@v3/gems/mongoid-2.0.2/lib/mongoid/attributes.rb:182:in `typed_value_for'
from /Users/pww/.rvm/gems/ree-1.8.7-2011.03@v3/gems/mongoid-2.0.2/lib/mongoid/attributes.rb:96:in `write_attribute'
from /Users/pww/.rvm/gems/ree-1.8.7-2011.03@v3/gems/mongoid-2.0.2/lib/mongoid/fields.rb:161:in `deadline='
from (irb):11
问题是,我尝试通过多种方式更改Mongoid Date的默认格式,包括
Date::DATE_FORMATS[:default] = "%d/%m/%Y"
其工作是以该格式显示数据,但不以该格式存储数据。我尝试了如下本地化文件:
date:
formats:
default: "%d/%m/%Y"
short: "%b %d"
long: "%B %d %Y"
它也不起作用。我可能不知道如何做对,但这可能是Mongoid的问题。
我正在使用:
Mongoid (2.0.2)
Rails (3.0.6)
ree (1.8.7-2011.03)
我知道这一点(https://github.com/mongoid/mongoid/issues/53)这更像是日期时区问题。
如有任何帮助和信息,我们将不胜感激。
谢谢。
如果属性定义为date,则需要一个有效的date对象。您应该负责解析值并指定日期。
p = Project.new
p.deadline = Time.Time.strptime("20/10/2011", "%d/%m/%Y")
实际上,我通过元编程重新定义日期字段的setter方法,成功地半自动地完成了这项工作
#this returns all the Date fields as an array
def self.date_fields
self.fields.map {|f,v| f if v.type == Date}.compact
end
def self.convert_dates
#go through all the fields and define a method for each
self.date_fields.each do |f|
define_method "#{f}=".intern do |arg|
#if there is a value
if arg.present?
begin
#try to parse it the normal d/m/Y way
new_date =Date.parse(arg)
rescue
#if it fails attempt the US format. Could add more formats by nesting
#rescues
new_date = DateTime.strptime(arg, '%m/%d/%Y')
end
#call super to let Mongoid handle it
super(new_date)
end
end
end
convert_dates将在初始化方法中调用(我使用的是自定义类工厂)
因为field:deadline,:type=>Date将生成Time类型的对象,而不是Date类型的对象。您可以在rails控制台中使用p.deadline.is_a? Date
将产生FALSE,但p.deadline.is_a? Time
将产生true,
通过将mongoid更新到最新版本修复了问题
gem 'mongoid', :git => "git://github.com/mongoid/mongoid.git"
这样解决:
# our form sends in month, day, year
def my_date=(*args)
if args.first.is_a?(String)
args[0] = Time.strptime(args[0], "%m/%d/%Y")
end
super(*args)
end