# File lib/sdb/active_sdb.rb, line 896
            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