# File lib/active_record/attribute_methods.rb, line 30
      def instance_method_already_implemented?(method_name)
        method_name = method_name.to_s
        index = ancestors.index(ActiveRecord::Base) || ancestors.length
        @_defined_class_methods         ||= ancestors.first(index).map { |m|
          m.instance_methods(false) | m.private_instance_methods(false)
        }.flatten.map {|m| m.to_s }.to_set

        @@_defined_activerecord_methods ||= defined_activerecord_methods
        raise DangerousAttributeError, "#{method_name} is defined by ActiveRecord" if @@_defined_activerecord_methods.include?(method_name)
        @_defined_class_methods.include?(method_name)
      end