Move changed_attributes into dirty.rb

Move serialization dirty into serialization.rb

1 files changed, 10 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/inheritance.rb b/activerecord/lib/active_record/inheritance.rb
index da73112e90..08fc91c9df 100644
--- a/activerecord/lib/active_record/inheritance.rb
+++ b/activerecord/lib/active_record/inheritance.rb
@@ -195,8 +195,18 @@ module ActiveRecord
       end
     end
 
+    def initialize_dup(other)
+      super
+      ensure_proper_type
+    end
+
     private
 
+    def initialize_internals_callback
+      super
+      ensure_proper_type
+    end
+
     # Sets the attribute used for single table inheritance to this class name if this is not the
     # ActiveRecord::Base descendant.
     # Considering the hierarchy Reply < Message < ActiveRecord::Base, this makes it possible to