Merge commit 'rails/master'

1 files changed, 7 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index 1f96e6dcc5..bb6869c6ce 100755
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -2864,6 +2864,13 @@ module ActiveRecord #:nodoc:
         @attributes.frozen?
       end
 
+      # Returns duplicated record with unfreezed attributes.
+      def dup
+        obj = super
+        obj.instance_variable_set('@attributes', instance_variable_get('@attributes').dup)
+        obj
+      end
+
       # Returns +true+ if the record is read only. Records loaded through joins with piggy-back
       # attributes will be marked as read only since they cannot be saved.
       def readonly?