def update_auto_increments
      self.class.incrementing_fields.each do |field, options|
        increment!(field, options) if options[:auto]
      end && true
    end
def update_auto_increments
      self.class.incrementing_fields.each do |field, options|
        increment!(field, options) if options[:auto]
      end && true
    end
Sets autoincrement values for all autoincrement fields.

 @return [ true ]