evaluate_attribute_method

# File activerecord/lib/active_record/attribute_methods.rb, line 154
        def evaluate_attribute_method(attr_name, method_definition, method_name=attr_name)

          unless method_name.to_s == primary_key.to_s
            generated_methods << method_name
          end

          begin
            class_eval(method_definition, __FILE__, __LINE__)
          rescue SyntaxError => err
            generated_methods.delete(attr_name)
            if logger
              logger.warn "Exception occurred during reader method compilation."
              logger.warn "Maybe #{attr_name} is not a valid Ruby identifier?"
              logger.warn "#{err.message}"
            end
          end
        end