firebase-对对象使用一个ref并将其推到其子数组上

这段代码可以工作,但是我使用两个ref访问同一对象的不同区域。

一个例程可能有多个页面。有没有一种方法可以创建新页面,只需使用一个ref将页面推送到$scope.routine.pages上,同时创建一个唯一的id?

angular.module('screenTester.auth.routine', [
    'screenTester.auth.routine.page'    
])

.config(['$stateProvider', function($stateProvider) {

    $stateProvider
        .state('auth.routine', {
            url: '/routine/:routineId',
            controller: 'RoutineCtrl',
            templateUrl: '/dist/auth/routine/routine.html'
        });

}])

.controller('RoutineCtrl', ['$scope', '$stateParams', '$firebase', function($scope, $stateParams, $firebase) {

    $scope.routineId = $stateParams.routineId;

    // Combine these two and still create pages with a unique id?
    var ref = new Firebase("https://url.firebaseio.com/user" + $scope.auth.user.id + '/routines/' + $scope.routineId);
    var sync = $firebase(ref);

    var ref = new Firebase("https://url.firebaseio.com/user" + $scope.auth.user.id + '/routines/' + $scope.routineId + '/pages');
    var pagesSync = $firebase(ref);

    $scope.createPage = function() {
        // What method would I use here on `$scope.routine`?        
        $scope.routinePages.$add($scope.newPage);
        $scope.routinePages.$save();
        $scope.newPage = {};
        $scope.toggles.showCreatePage = false;
    };

    $scope.init = function() {
      $scope.routine = sync.$asObject();
      $scope.routinePages = pagesSync.$asArray();

      $scope.newPage = {};
      $scope.toggles = {};
    };

    $scope.init();

}]);

免责声明:不是我的最终代码,我正在学习firebase的工作原理,看看它是否是一个好的解决方案。