# File lib/sdb/active_sdb.rb, line 941
      def delete_values(attrs)
        raise_on_id_absence
        attrs = uniq_values(attrs)
        attrs.delete('id')
        unless attrs.blank?
          connection.delete_attributes(domain, id, attrs)
          attrs.each do |attribute, values|
            # remove the values from the attribute
            if @attributes[attribute]
              @attributes[attribute] -= values
            else
              # if the attribute is unknown remove it from a resulting list of fixed attributes
              attrs.delete(attribute)
            end
          end
        end
        attrs
      end