instance method update_with_dirty

# File activerecord/lib/active_record/dirty.rb, line 142
      def update_with_dirty
        if partial_updates?
          # Serialized attributes should always be written in case they've been
          # changed in place.
          update_without_dirty(changed | (attributes.keys & self.class.serialized_attributes.keys))
        else
          update_without_dirty
        end
      end