Re: Ruby DateTime YAML extensions

Is there any problem, which stops you from reusing YAML's timestamp?

On Fri, Sep 5, 2008 at 5:57 PM, Sam Granieri, Jr <sam-HbX/[email protected]> wrote:
> I'm writing a plugin for a rails app to allow yaml to serialize and
> deserialize DateTimes, especially datetimes that are beyond the range
> of what a Time Object can store
>
> Basically, I want
>   require 'date'
>   require 'time'
>   require 'yaml'
>   YAML::load(DateTime.now.to_yaml).class
> to return DateTime instead of time.
>
> Here's the ruby code I came up with
>
> require 'yaml'
> require 'date'
> require 'time'
> class DateTime
>   yaml_as "tag:yaml.org,2002:timestamp"
>   yaml_as "tag:ruby.yaml.org,2002:#{self}"
>   def to_yaml( opts = {} )
>     YAML::quick_emit( nil, opts ) do |out|
>       out.scalar(taguri,self.to_s, :plain)
>     end
>   end
>   def self.yaml_new( klass, tag, val )
>     DateTime.parse(val)
>   end
> end
>
> And here's the test code
>
> class YamlDatetimeFixTest < Test::Unit::TestCase
>   def setup
>     @fardate = DateTime.new(1999,1,1)
>   end
>   # Replace this with your real tests.
>   def test_this_plugin
>     assert_equal(DateTime,YAML::load(DateTime.now.to_yaml).class)
>     yml = @fardate.to_yaml
>     puts yml
>     begin
>       res = YAML::load(yml)
>       puts res.to_s
>     rescue Exception => e
>       puts "fail"
>     end
>     assert_equal(res.class, DateTime)
>   end
> end
>
> I get these results:
> Started
> --- !ruby/DateTime 1999-01-01T00:00:00+00:00
> 1999-01-01T00:00:00+00:00
> .
> Finished in 0.012187 seconds.
>
> 1 tests, 2 assertions, 0 failures, 0 errors
>
> I think I have everything down, but the one thing that just seems to
> bug me is my DateTime.to_yaml line of code outputs
>
> --- !ruby/DateTime 1999-01-01T00:00:00+00:00
> instead of
> --- 1999-01-01T00:00:00+00:00
>
> Is there a way to fix this? I could really welcome the help.
>
> Thanks!
>
> I'm in irc.freenode.net#yaml as samgranieri as well.
>
>
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-- 
Alexey Zakhlestin
http://blog.milkfarmsoft.com/

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