code: function(model) {
        _.each(model.changedAttributes(), function(value, fieldName) {
          this.set(fieldName, this.__cloneVal(value));
        }, this);
        this.__updateCache(model);
      }
docs: NOTE: When looking to update the form model manually, call this.pull().
  Updates this form model with the changed attributes of a given object model
  @param model {Backbone.Model instance} the object model that has been changed
  @private
  @method __updateFormModel