From: "Peña, Botp" <botp@...>
Date: 2008-08-20T13:34:38+09:00
Subject: Re: Marshaling an object destroys dynamically created methods

From: Patrick Li [mailto:patrickli_2001@hotmail.com] 
# I noticed this this afternoon:
# Unmarshaling a marshaled object, makes all dynamically created methods
# private.

check your ruby version, pls

class MyPage
  def initialize
    MyPage.class_eval do
      def print
        puts @a
      end
    end
  end
end
#=> nil

#Test the class
page = MyPage.new
#=> #<MyPage:0x28d7154>
page.print #prints nil
nil
#=> nil

#Marshal the object
File.open("object.obj","w") do |f|
  Marshal.dump(page, f)
end
#=> #<File:object.obj (closed)>

#UnMarshal the object, and try printing again
page = nil
#=> nil
File.open("object.obj","r") do |f|
  page = Marshal.load(f)
end
#=> #<MyPage:0x28c1980>
page.print
nil
#=> nil

[RUBY_VERSION,RUBY_PATCHLEVEL,RUBY_RELEASE_DATE,RUBY_PLATFORM]
#=> ["1.8.6", 286, "2008-08-08", "i386-mswin32"]

kind regards -botp