From f74227d30f9389b4b23a888c9af49fb9b8248e1f Mon Sep 17 00:00:00 2001
From: Josh Goebel <dreamer3@gmail.com>
Date: Sat, 7 Jul 2012 02:04:45 -0400
Subject: [PATCH] deep clone the hash instead of marshalling so some object
 types (IO, etc) do not cause subclassing to blow up

---
 lib/httparty/module_inheritable_attributes.rb | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/lib/httparty/module_inheritable_attributes.rb b/lib/httparty/module_inheritable_attributes.rb
index 9f4584ad..879ca259 100644
--- a/lib/httparty/module_inheritable_attributes.rb
+++ b/lib/httparty/module_inheritable_attributes.rb
@@ -4,6 +4,16 @@ def self.included(base)
       base.extend(ClassMethods)
     end
 
+    # borrowed from Rails 3.2 ActiveSupport
+    def self.hash_deep_dup(h)
+      duplicate = h.dup
+      duplicate.each_pair do |k,v|
+        tv = duplicate[k]
+        duplicate[k] = tv.is_a?(Hash) && v.is_a?(Hash) ? hash_deep_dup(tv) : v
+      end
+      duplicate
+    end
+
     module ClassMethods #:nodoc:
       def mattr_inheritable(*args)
         @mattr_inheritable_attrs ||= [:mattr_inheritable_attrs]
@@ -22,7 +32,7 @@ def inherited(subclass)
           if instance_variable_get(ivar).respond_to?(:merge)
             method = <<-EOM
               def self.#{inheritable_attribute}
-                #{ivar} = superclass.#{inheritable_attribute}.merge Marshal.load(Marshal.dump(#{ivar}))
+                #{ivar} = superclass.#{inheritable_attribute}.merge ModuleInheritableAttributes.hash_deep_dup(#{ivar})
               end
             EOM
             subclass.class_eval method