From: "Damián M. González" <lists@...>
Date: 2012-09-13T08:13:51+09:00
Subject: Marshaling classes

Guys, how are you?
 I'm stuck thinking about how can I save the state of a class. I want to
save the class variables of some classes. Do I have to require to
metaprogramming for this? I mean: save those variables in an object,
then dump it marshaling and then re-construct a class from that object
when is loaded. I'll try to explain the situation in an example:

class Dog
 @@quantity = 5
   def self.change_quantity=(n)
     @@quantity = n
   end
   def self.show_quantity
     @@quantity
   end
end

Dog.change_quantity = 99

File.open('anyfile.mrs', 'w+') do |f|
  Marshal.dump(Dog, f)
end

Dog.change_quantity = 50

Marshal.load(File.open('anyfile.mrs'))

Dog.show_quantity
#=> 50

#I want to show 99

 So as you can see I'm very confused. This is probably not the way to do
what I want, do you have any advice for me? The objetive is to save the
"state" of a class, save the values of all his class variables. Thanks.
Damián.

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