docs: function(key) {
        var self = this; 
        if (!this._order) {
          this._order = [];
        }
        Parse._arrayEach(arguments, function(key) {
          if (Array.isArray(key)) {
            key = key.join();
          }
          self._order = self._order.concat(key.replace(/\s/g, "").split(","));
        });
        return this;
      }