mutations_from_database

# File activemodel/lib/active_model/dirty.rb, line 260
      def mutations_from_database
        unless defined?(@mutations_from_database)
          @mutations_from_database = nil
        end
        @mutations_from_database ||= if defined?(@attributes)
          ActiveModel::AttributeMutationTracker.new(@attributes)
        else
          NullMutationTracker.instance
        end
      end