From ff73aa6b00b11c96fe12956c8737e4f345dab08d Mon Sep 17 00:00:00 2001
From: Federico Brubacher <fbrubacher@gmail.com>
Date: Sun, 16 May 2010 07:24:41 -0300
Subject: [PATCH] a cloned object no longer mimics changed flags from creator , plus a test case

---
 activemodel/lib/active_model/dirty.rb  |    9 +++++----
 activerecord/lib/active_record/base.rb |    1 +
 activerecord/test/cases/dirty_test.rb  |    9 +++++++++
 3 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/activemodel/lib/active_model/dirty.rb b/activemodel/lib/active_model/dirty.rb
index a7ee15a..bbcc345 100644
--- a/activemodel/lib/active_model/dirty.rb
+++ b/activemodel/lib/active_model/dirty.rb
@@ -124,11 +124,12 @@ module ActiveModel
       @previously_changed
     end
 
+    # Map of change <tt>attr => original value</tt>.
+    def changed_attributes
+      @changed_attributes ||= {}
+    end
+
     private
-      # Map of change <tt>attr => original value</tt>.
-      def changed_attributes
-        @changed_attributes ||= {}
-      end
 
       # Handle <tt>*_changed?</tt> for +method_missing+.
       def attribute_changed?(attr)
diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index 04c474c..c02af32 100755
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -1467,6 +1467,7 @@ module ActiveRecord #:nodoc:
         @attributes_cache = {}
         @new_record = true
         ensure_proper_type
+        @changed_attributes = other.changed_attributes.dup
 
         if scope = self.class.send(:current_scoped_methods)
           create_with = scope.scope_for_create
diff --git a/activerecord/test/cases/dirty_test.rb b/activerecord/test/cases/dirty_test.rb
index 7a17ef1..3ea2948 100644
--- a/activerecord/test/cases/dirty_test.rb
+++ b/activerecord/test/cases/dirty_test.rb
@@ -338,6 +338,15 @@ class DirtyTest < ActiveRecord::TestCase
     assert !pirate.changed?
   end
 
+  def test_cloned_objects_should_not_copy_dirty_flag_from_creator
+    pirate = Pirate.create!(:catchphrase => "shiver me timbers")
+    pirate_clone = pirate.clone
+    pirate_clone.reset_catchphrase!
+    pirate.catchphrase = "I love Rum"
+    assert pirate.catchphrase_changed?
+    assert !pirate_clone.catchphrase_changed?
+  end
+
   def test_reverted_changes_are_not_dirty
     phrase = "shiver me timbers"
     pirate = Pirate.create!(:catchphrase => phrase)
-- 
1.7.0.5