Angular-HttpClient：将对象映射到数组属性

Question

我正在调用一个 API，其中 returns 我是一个 JSON 对象。我需要将这个对象映射到一个数组。

下面是我的代码，但是在 API 调用之后既没有得到任何响应也没有任何错误。

export class Features {
  MenuId: number;
  MenuName: string;
  Description: string;
  RoutePath: string;
}

featureList: Features[] = [];
 constructor(private http: HttpClient)

 getFeatureListByLoggedInUser(userID: number) { debugger;       
    return this.http.get(this.myAppUrl + "api/Employee/GetMenusByUID/" + userID)     
      .pipe(
      map(
        (data: any[]) => {
        debugger;
        this.featureList = data;
        //return true;
      }), catchError(error => {
        debugger;
        return throwError('Something went wrong!')
      })
    );
 }

也试过下面的代码，但它给我一个错误：

Type object is not assignable to type 'any[]'

 featureList: Array<any> = [];

 getFeatureListByLoggedInUser(userID: number) { debugger;  
    return this.http.get(this.myAppUrl + "api/Employee/GetMenusByUID/" + userID)
      .subscribe(
        data => {
          debugger;
          this.featureList = data;            
      });
 }

编辑：

 return this.http.get<Array<Features>>(this.myAppUrl + "api/Employee/GetMenusByUID/" + userID)   
      .subscribe(
        data => {
          debugger;
          //this.featureList = data;  
      });

Answer 1

您不是return来自.map()。你应该 return this.featureList 从服务

getFeatureListByLoggedInUser(userID: number) { debugger;       
    return this.http.get(this.myAppUrl + "api/Employee/GetMenusByUID/" + userID)     
      .pipe(
      map(
        (data: any[]) => {
        debugger;
       return this.featureList = data;
      }), catchError(error => {
        debugger;
        return throwError('Something went wrong!')
      })
    );
 }

编辑

此外，map 在您的代码中似乎是不必要的，因为您没有在里面操纵任何东西。您可以取消它并保留 catchError 来处理错误。

getFeatureListByLoggedInUser(userID: number) {       
    return this.http.get(this.myAppUrl + "api/Employee/GetMenusByUID/" + userID)     
      .pipe(
           catchError(error => {
            return throwError('Something went wrong!')
      })
    );
 }

在你的组件中

this.service.getFeatureListByLoggedInUser(id)
      .subscribe(data => { this.featureList = data })

Angular-HttpClient：将对象映射到数组属性

Angular-HttpClient: Map object to array properties

rxjs

angular

angular-httpclient

angular6

rxjs6