code: 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);
              }
          });
      }
docs: Update record by ID of particular class. ({@link https://docsdev.quickblox.com/rest_api/CustomObjects_API.html#Retrieve_objects Read more})
  @memberof QB.data
  @param {string} className - A class name of record
  @param {object} data - Object of parameters
  @param {string} data._id - An ID of record to update
  @param {updateDataCallback} callback - The updateDataCallback function
  @example
  QB.data.update('GameOfThrones', {
  '_id': '53aaa06f535c12cea9007496',
  'pull': {
  'family':'Stark'
  }
  }, function(error, response) {
  if (error) {
  console.log(error);
  } else {
  console.log(response);
  }
  });