code: function (obj) {
              var model = (obj instanceof Model) ? obj : null;
              var view = (!model && obj instanceof Backbone.View) ? obj : null;
              var arr = (!model && !view && isArray(obj)) ? obj : null;
  
              if (arr) {
                  each(arr, this.deleteRow, this);
                  return this;
              }
  
              if (!view) {
                  view = this.subs.get(model);
              } else if (!model) {
                  model = view.model;
              }
  
              this.subs.remove(view);
              this.collection.remove(model);
              return this;
          }
docs: Removes a row or rows from the CollectionFormView and
  corresponding collection.
  @memberOf Backbone.CollectionFormView#
  @param  {Backbone.Model|Backbone.View|Backbone.View[]|Backbone.Model[]} obj
  Used to find models in the collection and views in the subViewManager
  and remove them.
  @return {Backbone.CollectionFormView}