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我在火力地堡DB以下节点使用$值:为什么我要在FirebaseObjectObservable
users
-$user
--public
---avatarUrl: 'https://myurl'
我找回这个网址是这样的:
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”是如下在我的服务:
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);
}
最后,这里是我的看法,我渲染图像:
<ion-item (click)="openChat(shortChat.id)">
<ion-avatar item-left>
<img [src]="(recipientAvatarUrl$ | async)?.$value" />
</ion-avatar>
</ion-item>
我不明白为什么我必须使用$ value来获取节点的值。我虽然认为异步管道会根据AngularFire2文档解开FirebaseObjectObservable。
任何线索?
这就解决了一个问题! ;)谢谢Yevgen! –