app.controller('NewPostController', function($scope, $http) {
    $scope.selection = [];
    $http.get('/new_post').success(function(tags) {
    $scope.tags = tags;
});

$scope.toggleSelection = function toggleSelection(tag) {
    var idx = $scope.selection.indexOf(tag);

    // is currently selected
    if (idx > -1) {
        $scope.selection.splice(idx, 1);
    }

    // is newly selected
    else {
        $scope.selection.push(tag);
    }
    };

    $scope.addPost = function() {
        $scope.post.selection = $scope.selection;
        $http.post('new_post', $scope.post).success(function() {
        });
    }

class PostController extends BaseController {
    public function add() {
        if($post = Post::insertGetId(array('title' => Input::json('title'),
                                           'body' => Input::json('body')))) {
            $tags = [];
            foreach(Input::json('selection') as $tag) {
                array_push($tags, $tag['id']);
            }
            $new_post = Post::find($post);
            $new_post->tags()->sync($tags);
        }
    }
}