code: function(objects) {
        if (!_.isArray(objects)) {
          objects = [objects];
        }
  
        var change = new Parse.Op.Relation(objects, []);
        this.parent.set(this.key, change);
        this.targetClassName = change._targetClassName;
      }
docs: Adds a Parse.Object or an array of Parse.Objects to the relation.
  @param {} objects The item or items to add.