# File lib/couchrest/mixins/extended_attachments.rb, line 21
      def update_attachment(args={})
        raise ArgumentError unless args[:file] && args[:name]
        return unless has_attachment?(args[:name])
        delete_attachment(args[:name])
        set_attachment_attr(args)
      rescue ArgumentError => e
        raise ArgumentError, 'You must specify :file and :name'
      end