From: why the lucky stiff <ruby-talk@...>
Date: 2005-09-24T01:07:39+09:00
Subject: Re: Outputting custom YAML types in 1.8.3

Aaron Schrab wrote:
> require 'yaml'
> class Foo
>   def to_yaml_type; "!example.com,2005/Foo"; end
>   def to_yaml( opts={} )
>     YAML::quick_emit( object_id, opts ) do |out|
>       out.map( to_yaml_type ) do |map|
>         map.add :foo, 'bar'
>         map.add :one, 2
>       end
>     end
>   end
> end
> puts( { 'a' => Foo.new }.to_yaml )
>   
The out.map now takes YAML taguris.  Try:

   YAML::quick_emit( YAML.tagurize( to_yaml_type[1..-1] ) )

Or I would recommend switching to taguris completely in your code.
>   def to_yaml_type; "tag:example.com,2005:Foo"; end
>   
The YAML syntax "!example.com,2005/Foo" is just a shortcut for a taguri.
> So there are a couple changes.  First it's no longer outputting a line
> of dashes at the beginning.  Second, and more importantly, it's no
> longer including the type information.
>   
The long string of dashes at the beginning isn't required in YAML 1.0, 
so I've decided to default to headless.

_why