Move clear_timestamp_attributes into Timestamp module

activerecord/lib/active_record/base.rb

@@ -1849,7 +1849,7 @@ def initialize_dup(other)
 
         ensure_proper_type
         populate_with_current_scope_attributes
-        clear_timestamp_attributes
+        super
       end
 
       # Returns +true+ if the record is read only. Records loaded through joins with piggy-back
@@ -2113,14 +2113,6 @@ def populate_with_current_scope_attributes
           send("#{att}=", value) if respond_to?("#{att}=")
         end
       end
-
-      # Clear attributes and changed_attributes
-      def clear_timestamp_attributes
-        all_timestamp_attributes_in_model.each do |attribute_name|
-          self[attribute_name] = nil
-          changed_attributes.delete(attribute_name)
-        end
-      end
   end
 
   Base.class_eval do

activerecord/lib/active_record/timestamp.rb

@@ -37,6 +37,11 @@ module Timestamp
       self.record_timestamps = true
     end
 
+    def initialize_dup(other)
+      clear_timestamp_attributes
+      super
+    end
+
   private
 
     def create #:nodoc:
@@ -95,6 +100,13 @@ def all_timestamp_attributes #:nodoc:
     def current_time_from_proper_timezone #:nodoc:
       self.class.default_timezone == :utc ? Time.now.utc : Time.now
     end
+
+    # Clear attributes and changed_attributes
+    def clear_timestamp_attributes
+      all_timestamp_attributes_in_model.each do |attribute_name|
+        self[attribute_name] = nil
+        changed_attributes.delete(attribute_name)
+      end
+    end
   end
 end
-