javascript - 如何将 Observable 转换为 FirebaseObjectObservable

Question

代码:

(转换不适用于这两种方法)

1. this.af.database.object('/users/'+key)
          .do((something:any)=>console.log(something)) as FirebaseObjectObservable<any>;
2. ..switchMap(()=>this.af.database.object('/users/'+key)) as FirebaseObjectObservable<any>;

问题:

1. 有什么问题？
2. 我能否在不丢失任何数据的情况下随处将“any”替换为“User”类型？

Answer 1

好的解决了:

1. <FirebaseObjectObservable<any>>this.af.database.object('/users/'+key)
          .do((something:any)=>console.log(something));
2. <FirebaseObjectObservable<any>>..switchMap(()=>this.af.database.object('/users/'+key));

为了替换 any，我在我的用户类中添加了一个 $key 属性，所以现在我可以这样做:

1. <FirebaseObjectObservable<User>>this.af.database.object('/users/'+key)
          .do((something:any)=>console.log(something));
2. <FirebaseObjectObservable<User>>..switchMap(()=>this.af.database.object('/users/'+key));