nested_records_changed_for_autosave?

# File activerecord/lib/active_record/autosave_association.rb, line 282
      def nested_records_changed_for_autosave?
        @_nested_records_changed_for_autosave_already_called ||= false
        return false if @_nested_records_changed_for_autosave_already_called
        begin
          @_nested_records_changed_for_autosave_already_called = true
          self.class._reflections.values.any? do |reflection|
            if reflection.options[:autosave]
              association = association_instance_get(reflection.name)
              association && Array.wrap(association.target).any?(&:changed_for_autosave?)
            end
          end
        ensure
          @_nested_records_changed_for_autosave_already_called = false
        end
      end