From: synergism <synergism@...>
Date: 2009-02-18T03:38:52+09:00
Subject: Marshal.dump fails on extended OpenStruct

If I subclass OpenStruct and extend the subclass, I cannot
Marshal.dump it.  This is apparently because ostruct.rb has its own
custom marshal_dump / marshal_load that only cares about what's in
@table:

  def marshal_dump
    @table
  end
  def marshal_load(x)
    @table = x
    @table.each_key{|key| new_ostruct_member(key)}
  end

Is there no way to fix this in ostruct.rb to allow my 'bad' example
below to work?

require 'pp'
require 'ostruct'

case ARGV.first
    when /bad/i,nil
        class C < OpenStruct
            def initialize
                super()
                @var=123
            end
        end
    when /good/i
        class C
            def initialize
                @struct=OpenStruct.new
                @var=123
            end

            def method_missing method,*args,&block
                @struct.send method,*args,&block
            end
        end
end

c=C.new
c.a=:a
pp c
puts 'c.a=%s ' %  c.a
puts 'c var=%s' % c.instance_variable_get('@var')
x=Marshal.load(Marshal.dump(c))

pp x
puts 'x.a=%s ' %  x.a
puts 'x var=%s' % x.instance_variable_get('@var')