From: thebox <piergiuliano.bossi.news@...>
Date: 2007-03-03T13:30:08+09:00
Subject: YAML issue with Set?

What am I doing wrong?


#!/opt/local/bin/ruby
###############################
require 'set'
require 'yaml'
require 'tempfile'

def tempname(basename)
  file = Tempfile.new(basename)
  file.close(false)
  file.path
end

class U
  attr_accessor :name
  def initialize(n)
	@name = n
  end
  def ==(other)
  	name == other.name
  end
end

set = Set.new
set.add(U.new("one"))
set.add(U.new("two"))

filename = tempname("set_yaml")
File.open(filename, "w") {|f| YAML.dump(set, f)}

another_set = YAML.load(File.open(filename))

puts "#{set == another_set}"
###############################



The result that I get is the following:

###############################
xxx:~ piergiulianobossi$ ./set_yaml.rb
/opt/local/lib/ruby/1.8/yaml.rb:133:in `load': syntax error on line 3,
col -1: `    name: one (ArgumentError)
  : true

  !ruby/object:U ?
    name: two
  : true

'       from /opt/local/lib/ruby/1.8/yaml.rb:133:in `load'
        from ./set_yaml.rb:30
###############################

Running ruby on Mac OS/X 10.4

###############################
xxx:~ piergiulianobossi$ ruby -v
ruby 1.8.5 (2006-08-25) [i686-darwin8.8.1]
###############################