From: Marc-Andre Lafortune <redmine@...>
Date: 2009-12-28T11:32:32+09:00
Subject: [ruby-core:27339] [Bug #1744](Open) Error with Marshal dump/load on a delegated class.

Issue #1744 has been updated by Marc-Andre Lafortune.

Status changed from Closed to Open

On Sun, Dec 27, 2009 at 8:19 PM, Nobuyoshi Nakada <nobu@ruby-lang.org> wrote:
> This change has broken marshal format comatibility.

Indeed.

I can't think of a way to make it backward compatible, but for forward compatibility, how about the following?

diff --git a/lib/delegate.rb b/lib/delegate.rb
index f8a71f1..1516dac 100644
--- a/lib/delegate.rb
+++ b/lib/delegate.rb
@@ -184,16 +184,21 @@ class Delegator
   # Serialization support for the object returned by \_\_getobj\_\_.
   def marshal_dump
     [
+      :__v2__,
       instance_variables,
       instance_variables.map{|var| instance_variable_get(var)},
       __getobj__
     ]
   end
   # Reinitializes delegation from a serialized object.
-  def marshal_load(obj)
-    vars, values, obj = obj
-    vars.each_with_index{|var, i| instance_variable_set(var, values[i])}
-    __setobj__(obj)
+  def marshal_load(data)
+    version, vars, values, obj = data
+    if version == :__v2__
+      vars.each_with_index{|var, i| instance_variable_set(var, values[i])}
+      __setobj__(obj)
+    else
+      __setobj__(data)
+    end
   end

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http://redmine.ruby-lang.org/issues/show/1744

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