1 files changed, 5 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/type/serialized.rb b/activerecord/lib/active_record/type/serialized.rb
index abeea769c4..5b512433b0 100644
--- a/activerecord/lib/active_record/type/serialized.rb
+++ b/activerecord/lib/active_record/type/serialized.rb
@@ -26,6 +26,11 @@ module ActiveRecord
         end
       end
 
+      def changed_in_place?(raw_old_value, value)
+        return false if value.nil?
+        subtype.changed_in_place?(raw_old_value, coder.dump(value))
+      end
+
       def accessor
         ActiveRecord::Store::IndifferentHashAccessor
       end