# File lib/active_record/attribute_methods.rb, line 42
      def defined_activerecord_methods
        active_record = ActiveRecord::Base
        super_klass   = ActiveRecord::Base.superclass
        methods = (active_record.instance_methods - super_klass.instance_methods) +
                  (active_record.private_instance_methods - super_klass.private_instance_methods)
        methods.map {|m| m.to_s }.to_set
      end