[Yaml-core] problem at transfer with self-reference of domain types

[<pop...@fr...>]

Hi.
I try to use Yaml to store gnomecanvas items, where a group item has=20
other items, that refer to the group, but the=20
object created in my YAML::add_domain_type gets lost and instead of=20
that I get an other one from YAML.

A simple self-reference is enough for the same phenomena.

require "yaml"

class Foo
  attr_accessor :point
 =20
  def to_yaml_type
  =09"!Foo,2006/Foo"
  end
end

YAML::add_domain_type( 'Foo,2006', 'Foo' ) do |type, val|
  obj =3D Foo.new
  obj.point =3D obj
  p "object created in add_domain_type " + obj.inspect
  obj
end

#create an object with self ref
myFoo =3D Foo.new
myFoo.point =3D myFoo

yaml_Foo =3D myFoo.to_yaml
p yaml_Foo
=20
restored_obj =3D YAML::load(yaml_Foo)
p "restored_obj " + restored_obj.inspect


the output:

"--- &id001 !Foo,2006/Foo \npoint: *id001\n"
"object created in add_domain_type #<Foo:0x402cb1f8 @point=3D#<Foo:
0x402cb1f8 ...>>"
"restored_obj #<Foo:0x402cb694>"

My created object is destroyed but an other unusable one is alive.
The problem seems to be that the alias as BadAlias marked as my block=20
is called and I have no chance this point of view of Syck to change.
not even if I put the newly created object to val["point"] back.

What can I do? Should I emit direct? For that I have no doc found.

I use Yaml in Ruby 1.8.4 on Linux.

Arpad Popradi


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