update

# File activerecord/lib/active_record/base.rb, line 1799
      def update
        connection.update(
          "UPDATE #{self.class.table_name} " +
          "SET #{quoted_comma_pair_list(connection, attributes_with_quotes(false))} " +
          "WHERE #{connection.quote_column_name(self.class.primary_key)} = #{quote_value(id)}",
          "#{self.class.name} Update"
        )
      end