docs: function(className, data, callback) {
          /**
           * Callback for QB.data.update(className, data, callback)
           * @callback updateDataCallback
           * @param {object} error - The error object
           * @param {object} response - An object
           */
          this.service.ajax({
              'url': Utils.getUrl(config.urls.data, className + '/' + data._id),
              'type': 'PUT',
              'contentType': 'application/json; charset=utf-8',
              'isNeedStringify': true,
              'data': data
          }, function(err,result){
              if (err) {
                  callback(err, null);
              } else {
                  callback (err, result);
              }
          });
      }