订阅一个 AngularFireObject

Question

我刚刚升级到 AngularFire2 rc 5.0。

我修改了我的代码，使其与新类型和功能相匹配，但是在尝试订阅 a 时出现以下错误.object(path)：

Property 'subscribe' does not exist on type 'AngularFireObject'

我的代码如下。

供应商：

getEvent(id: string): AngularFireObject<any> {
    let path = `/events/${id}`;
    return this.af.object(path).valueChanges();
  }

页：

...
event$: AngularFireObject<any>;
...

// Retrieve event's info
this.event$ = this.eventService.getEvent(this.id);

// Retrieve event's ownership info
let subscription = this.event$.subscribe(event => {
  this.owner$ = this.userService.getUserPublicInfo(event.owner);
});

任何的想法？

Answer 1

你正在使用的valueChanges()意义getEvent(id: string)是返回FirebaseObjectObservable<any>不AngularFireObject<any>。检查这里。

AngularFireObject<any>由返回this.af.object(path)

更改函数的返回类型。

getEvent(id: string): FirebaseObjectObservable<any> {
    let path = `/events/${id}`;
    return this.af.object(path).valueChanges();
  }