如何扩展Angular2的HTTP类以自定义它(在Ionic2项目中)

Question

我正在尝试为我的Ionic2-Angular2应用程序扩展HTTP类。主要问题来自从（本地|会话）存储中获取一个物品，该存储在ionics2中返回了诺言，我必须将其转换为可观察的（或至少我认为是因为那是因为），以使扩展程序与一致我要扩展的类的每个函数的返回值类型。

getCustomRequest(url:string, method:string, options?: RequestOptionsArgs, body?:any):Observable<any>{
    let headers = new Headers({'Content-Type': 'application/json'});
    return Observable.fromPromise(
      this.storage.get("authToken").then(
        data => {
          console.log('Token '+data);
          headers.append("Authorization", 'Token '+data);
          return this.getNewReq({method, headers, body, url}, options);
        },
        error => {
          console.log('no token!');
          return this.getNewReq({method, headers, body, url}, options);
        }
      )
    );
  }

  private getNewReq(reqOptObject, options):Request{
    let reqOpt = new RequestOptions(reqOptObject);
    if (options) {
      reqOpt = reqOpt.merge(options);
    }
    return new Request(reqOpt);
  }
  request(url: string|Request, options?: RequestOptionsArgs): Observable<Response> {
    return super.request(url, options);
  }

  post(url: string, body: any, options?: RequestOptionsArgs): Observable<Response>{
    return this.getCustomRequest(url, 'POST', options, body)
               .map( newReq => { console.log(newReq); return this.request(newReq); });
  }

错误消息是[line return this.getCustomRequest（url ...]：键入'observable>'不能分配给'observable'。 "可观察到"不能分配"响应"。类型中缺少属性"类型" "可观察"。

Answer 1

因为 this.request()返回 Observable，我认为您需要使用merge而不是map

  post(url: string, body: any, options?: RequestOptionsArgs): Observable<Response>{
    return this.getCustomRequest(url, 'POST', options, body)
               .merge( newReq => { console.log(newReq); return this.request(newReq); });
  }