Angular.js: Is it possible to re-render ng-repeats based on existing scope data?

Question

I have a bunch of connected ul lists in my view which are using a jQuery UI: Sortable directive to facilitate drag and drop and reordering of the list items.

Answer 1

When the user starts filling out the form, I would set

$scope.oldData = angular.copy($scope.data);

Then let the user edit $scope.data using the form as he likes.

Then if the user presses cancel, just set $scope.data = $scope.oldData.