docs: function(modelIdentifier) {
              var model = this.get(modelIdentifier);
              parentClass.remove.apply(this, arguments);
              if (model) {
                var trackedIdsWithoutModel = this.getTrackedIds();
                trackedIdsWithoutModel = _.without(trackedIdsWithoutModel, model.id);
                this.trackIds(trackedIdsWithoutModel);
              }
            }