setNewLabelOrder(newLabelOrderOnlyIds) {
    if (this.labels.length == newLabelOrderOnlyIds.length) {
      if (this.labels.every(_label => newLabelOrderOnlyIds.indexOf(_label._id) >= 0)) {
        const newLabels = _.sortBy(this.labels, _label => newLabelOrderOnlyIds.indexOf(_label._id));
        if (this.labels.length == newLabels.length) {
          Boards.direct.update(this._id, {$set: {labels: newLabels}});
        }
      }
    }
  }
sets the new label order
@param newLabelOrderOnlyIds new order array of _id, e.g. Array(4) [ "FvtD34", "PAEgDP", "LjRBxH", "YJ8sZz" ]