Angular 4 HttpClientModule 和 map() 函数

Question

我遇到了一个关于新 HttpClientModule 和来自 RX.js 的 map() 函数的问题。

我想做的是更改来自 get() 方法的可观察对象中返回数组的对象。

我当前的代码:

get(url: string): Observable < any > {
  return this.http.get(this.config.baseUrl + url);
}


playerSearch(text: string): Observable < any[] > {
  if (text == "" || !text) {
    return Observable.of([]);
  } else {
    return this.auth.get(`/players?$expand=Contact($expand=Blob)&$filter=contains(Contact/LastName, '${text}') or contains(Contact/FirstName, '${text}')`).map((x) => {
      return {
        Id: x.Id,
        Name: x.Contact.FirstName + " " + x.Contact.FatherName.substring(0, 2) + ". " + x.Contact.LastName,
        BlobSrc: this.utilitiesService.imageLinkCreator(x)
      }
    });
  }
}

search = (text$: Observable < string > ) =>
  text$
  .debounceTime(300)
  .distinctUntilChanged()
  .do(() => this.searching = true)
  .switchMap(term =>
    this.dataService.playerSearch(term)
    .do(() => this.searchFailed = false)
    .catch(() => {
      this.searchFailed = true;
      return Observable.of([]);
    }))
  .do(() => this.searching = false);

我得到的错误:

Type 'Observable<{ Id: any; Name: string; BlobSrc: string; }>' is not assignable to type 'Observable'.

Type '{ Id: any; Name: string; BlobSrc: string; }' is not assignable to type 'any[]'.

据我所知，map() 方法返回一个 observable，其值只有一个对象而不是一个数组。

为了返回包含 { Id: any; 数组的可观察对象，正确的语法是什么？名称:字符串； BlobSrc:字符串； } 对象？

Answer 1

如果您的 http 请求返回一个玩家数组，那么您的代码应该是这样的:

get(url: string): Observable<any[]> {
        return this.http.get(this.config.baseUrl + url);
    }


playerSearch(text: string): Observable<any[]> {
    if (text == "" || !text) {
        return Observable.of([]);
    } else {
        return this.auth.get(`/players?$expand=Contact($expand=Blob)&$filter=contains(Contact/LastName, '${text}') or contains(Contact/FirstName, '${text}')`).map((arr: any[]) => {
            return arr.map(x => ({
                Id: x.Id,
                Name: x.Contact.FirstName + " " + x.Contact.FatherName.substring(0, 2) + ". " + x.Contact.LastName,
                BlobSrc: this.utilitiesService.imageLinkCreator(x)
            });
        });
    }
}