Needs $scope.$digest()

[barryvdh]

In your example, after adding/removing a card, the $scope.$digest() needs to be called. Otherwise changes are not reflected, at least in Angular 1.4 in my case..

[theblang]

@barryvdh Alternatively, you can wrap your model changes in a $timeout. Not exactly sure why at the moment, but it does work.

[graingert]

@mattblang $timeout runs $digest.