# File lib/couchdb_adapter/attachments.rb, line 15
          def add_attachment(file, options = {})
            assert_attachments_property

            filename = File.basename(file.path)

            content_type = options[:content_type] || begin
              mime_types = MIME::Types.of(filename)
              mime_types.empty? ? 'application/octet-stream' : mime_types.first.content_type
            end

            name = options[:name] || filename
            data = file.read

            if new_record? || !model.properties.has_property?(:rev)
              self.attachments ||= {}
              self.attachments[name] = {
                'content_type' => content_type,
                'data'         => Base64.encode64(data).chomp,
              }
            else
              adapter = repository.adapter
              http = Net::HTTP.new(adapter.uri.host, adapter.uri.port)
              uri = Addressable::URI.encode_component("#{attachment_path(name)}?rev=#{self.rev}")
              headers = {
                'Content-Length' => data.size.to_s,
                'Content-Type'   => content_type,
              }
              http.put(uri, data, headers)
              self.reload
            end

          end