Angular ng选项不从异步调用更新

我有一个从异步调用加载的select元素的选项列表。调用已成功执行，但选择未更新

html

有没有办法通过ng更新选择选项

以下工作：

-选择命令- {{command.name}

---

这很奇怪，在你看来，我看到angularjs，在你的控制器中，我看到Angular2+哼哼，我继承了这个项目，以前从未使用过angular，所以我无法告诉你我在使用什么！

<select ng-model="selectedCommand"
        ng-options="command as command.name group by command.group for command in commands" >
    <option value="">-- Please select --</option>
</select>

populateCommands(context, dataService) {
    dataService.getCommands()
        .do(console.log)
        .mergeMap(Observable.from)
        .mergeMap(group => {
            return Observable.from(group.commands)
                .map(command => {
                    command.group = group.name;
                    return command;
                })
        }).pipe(toArray())
        .subscribe(commands => {
            console.log(commands);
            context.commands = commands;
        });
}

ngOnInit() {
    var dataService = this.dataService;
    var populateCommands = this.populateCommands;
    var context = this;
    this.data.getLoggedInUser()
        .do(function() { populateCommands(context, dataService);})
        .subscribe(user => {
            this.loggedInUser = user;
        })
    }