# File lib/couchrest/mixins/attachments.rb, line 6
      def put_attachment(name, file, options={})
        raise ArgumentError, "doc must be saved" unless self.rev
        raise ArgumentError, "doc.database required to put_attachment" unless database
        result = database.put_attachment(self, name, file, options)
        self['_rev'] = result['rev']
        result['ok']
      end