update_entry

# File activerecord/lib/active_record/internal_metadata.rb, line 142
      def update_entry(connection, key, new_value)
        um = Arel::UpdateManager.new(arel_table)
        um.set [
          [arel_table[value_key], new_value],
          [arel_table[:updated_at], current_time(connection)]
        ]

        um.where(arel_table[primary_key].eq(key))

        connection.update(um, "#{self.class} Update")
      end