1
我在火力地堡DB以下節點使用$值:爲什麼我要在FirebaseObjectObservable
users
-$user
--public
---avatarUrl: 'https://myurl'
我找回這個網址是這樣的:
lastMessage$: Observable<any>;
recipientAvatarUrl$: FirebaseObjectObservable<any>;
constructor(
public navCtrl: NavController,
public messageService: MessageService,
public authService: AuthService,
public userService: UserService
) {
console.log('ChatPreviewComponent#constructor');
}
ngOnInit(): void {
this.recipientAvatarUrl$ = this.userService.getUserAvatarUrl(this.chat.recipient, this.authService.getCurrenUserCompany());
}
功能「getUserAvatarUrl」是如下在我的服務:
getUserAvatarUrl(uid: string, company: string): any {
console.log('UserService#getUserAvatarUrl - Get user avatar url for ', uid);
let path = `/${company}/users/${uid}/public/avatarUrl`;
return this.af.database.object(path);
}
最後,這裏是我的看法,我渲染圖像:
<ion-item (click)="openChat(shortChat.id)">
<ion-avatar item-left>
<img [src]="(recipientAvatarUrl$ | async)?.$value" />
</ion-avatar>
</ion-item>
我不明白爲什麼我必須使用$ value來獲取節點的值。我雖然認爲異步管道會根據AngularFire2文檔解開FirebaseObjectObservable。
任何線索?
這就解決了一個問題! ;)謝謝Yevgen! –