From: Adam Shelly <adam.shelly@...>
Date: 2005-08-31T10:18:31+09:00
Subject: beginners YAML question

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I needed a class that acted like a container, as well as doing other things=
.=20
I tried making it a subclass of Array, instead of adding an Array member. I=
t=20
was working fine until I tried to reload it from YAML. Here is some code=20
that reproduces the problem. It seems like the Size parameter is not being=
=20
output in the YAML string.=20

- Why doesn't it work?
- How can I make it work?
----

require 'Yaml'

class Box< Array
def initialize size
@size =3D size
end
def size
@size
end
end


box =3D Box.new (2)
box << "orange"
box_yaml =3D box.to_yaml
p box_yaml

# prints "--- !ruby/array:Box \n- orange"

box2 =3D YAML::load(box_yaml)

# produces:
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D ArgumentError =3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=20
c:\ruby\lib\ruby\1.8/yaml/rubytypes.rb:239:in `initialize'=20
o =3D obj_class.new=20
c:\ruby\lib\ruby\1.8/yaml/rubytypes.rb:239:in `new'=20
o =3D obj_class.new=20
c:\ruby\lib\ruby\1.8/yaml/rubytypes.rb:239=20
o =3D obj_class.new=20
c:\ruby\lib\ruby\1.8/yaml/rubytypes.rb:235:in `call'=20
array_proc =3D Proc.new { |type, val|=20
c:\ruby\lib\ruby\1.8/Yaml.rb:119:in `transfer'=20
yp =3D @@parser.new.load( io )=20
c:\ruby\lib\ruby\1.8/Yaml.rb:119:in `load'=20
yp =3D @@parser.new.load( io )=20
c:\ruby\lib\ruby\1.8/Yaml.rb:119:in `load'=20
yp =3D @@parser.new.load( io )=20
c:\ruby\lib\ruby\1.8\test.rb:21=20
box2 =3D YAML::load(box_yaml)=20
c:\ruby\lib\ruby\site_ruby\1.8/rubygems/custom_require.rb:18:in `require__'=
=20
require__ path=20
c:\ruby\lib\ruby\site_ruby\1.8/rubygems/custom_require.rb:18:in `require'=
=20
require__ path=20

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=20
Exception: wrong number of arguments (0 for 1)=20


Thanks,
-Adam

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