    # File lib/active_record/base.rb, line 2126
          def attributes(options = nil)
            attributes = clone_attributes :read_attribute

            if options.nil?
              attributes
            else
              if except = options[:except]
                except = Array(except).collect { |attribute| attribute.to_s }
                except.each { |attribute_name| attributes.delete(attribute_name) }
                attributes
              elsif only = options[:only]
                only = Array(only).collect { |attribute| attribute.to_s }
                attributes.delete_if { |key, value| !only.include?(key) }
                attributes
              else
                raise ArgumentError, "Options does not specify :except or :only (#{options.keys.inspect})"
              end
            end
          end