Question

我面临来自RX.js的新HttpClientModule和map()功能的问题。

我想要做的是更改来自get()方法的observable内返回数组的对象。

我的密码：

＆＃13;

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);

＆＃13;

我得到的错误：

键入＆＃39; Observable＆lt; {Id：any;名称：字符串; BlobSrc：string; }＆GT;＆＃39;不能分配给＆＃39; Observable＆＃39;。

输入＆＃39; {Id：any;名称：字符串; BlobSrc：string; }＆＃39;不能指定为＆＃39;任何[]＆＃39;。

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

返回包含{ Id: any; Name: string; BlobSrc: string; }个对象数组的observable的正确语法是什么？

Answer 1

如果您的http请求返回了一系列播放器，那么这就是您的代码的样子：

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)
            });
        });
    }
}

Answer 2

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 => {
                    debugger;
                    ({
                        Id: x.Id,
                        Name: x.Contact.FirstName + " " + x.Contact.FatherName.substring(0, 2) + ". " + x.Contact.LastName,
                        BlobSrc: this.utilitiesService.imageLinkCreator(x)
                    })
                });
            });
    }
}

这是我尝试运行的代码，基于你的Amit。我在嵌套的map中添加了一个调试器，但从未进入。没有实际错误。

Angular 4 HttpClientModule和map（）函数

2 个答案: