define_question_method

# File activerecord/lib/active_record/base.rb, line 1933
      def define_question_method(attr_name)
        unless attr_name.to_s == self.class.primary_key.to_s
          self.class.read_methods << "#{attr_name}?"
        end
        
        evaluate_read_method attr_name, "def #{attr_name}?; query_attribute('#{attr_name}'); end"
      end