How to force the user to see the login page on his first session on the app

I found the solution in this issue report :

So the solution is the following :

 $ionicModal.fromTemplateUrl('templates/login.html', {
    scope: $scope,
    hardwareBackButtonClose: false
  }).then(function(modal) {
    $scope.modal = modal;
    $scope.isUser = sessionService.get("user") ? true : false;
    if( !$scope.isUser ) {
      $scope.modal.show();
    }
  });