checkboxes that append to a model in Angular.js

I have a model, which will be related to a number of other models. Think of a stack overflow question, for example, where it is a question related to tags. The final Object might look as follows before a POST or a PUT:

{
  id: 28329332,
  title: "checkboxes that append to a model in Angular.js",
  tags: [{
    id: 5678,
    name: "angularjs"
  }, {
    id: 890,
    name: "JavaScript"
  }]
}

So far, I have the following controller:

.controller('CreateQuestionCtrl',
    function($scope, $location, Question, Tag) {
      $scope.question = new Question();
      $scope.page = 1;
      $scope.getTags = function() {
        Tag.query({ page: $scope.page }, function(data) {
          $scope.tags = data;
        }, function(err) {
          // to do, error when they try to use a page that doesn't exist
        })
      };
      $scope.create = function() {
        $scope.question.$save(function(data) {
          $location.path("/question/" + data.id);
        });
      };
      $scope.$watch($scope.page, $scope.getTags);
    }
  )

So I display all of the tags, paginated, on the page. I want them to be able to select the given tags and append it to my model so that it can be saved.

How can I create a checkbox interface where it updates the $scope.question with the selected other models?