# File lib/thinking_sphinx/active_record/delta.rb, line 49
          def indexed_data_changed?
            sphinx_indexes.any? { |index|
              index.fields.any? { |field| field.changed?(self) } ||
              index.attributes.any? { |attrib|
                attrib.public? && attrib.changed?(self) && !attrib.updatable?
              }
            }
          end