id

# File activerecord/lib/active_record/base.rb, line 2485
      def id
        attr_name = self.class.primary_key
        column = column_for_attribute(attr_name)

        self.class.send(:define_read_method, :id, attr_name, column)
        # now that the method exists, call it
        self.send attr_name.to_sym

      end