Answer by dalcam for Is there a pattern for dealing with "Cancel" in AngularJS modal dialogs?

//on edit, make a copy of the original model and store it on scope
function edit(model){
  //put model on scope for the cancel method to access
  $scope.modelBeingEdited = model;
  //copy from model -> scope.originalModel
  angular.copy(model,$scope.originalModel);  
}

function cancelEdit(){
  //copy from scope.original back to your model 
  angular.copy($scope.originalModel, $scope.modelBeingEdited)  
}