Property 'toPromise' does not exist on type 'Observable<Response>'

import { Headers, Http } from '@angular/http';


@Injectable()
export class PublisherService{


private publishersUrl = 'app/publisher';


constructor(private http: Http) { }


getPublishers(): Promise<Publisher[]>{
return this.http.get(this.publishersUrl)
.toPromise()
.then(response => response.json().data)
.catch(this.handleError);
}
}

I am getting this error:

Property 'toPromise' does not exist on type 'Observable'.any

58876 次浏览

小开

最佳答案

You need to add the operator like this:

import 'rxjs/add/operator/toPromise';

This is needed for every rxjs operator you want to use.

小开

Try adding 'Response' to your import statement from '@angular/http' like this :

import {Http, Headers, Response} from '@angular/http';

Also i noticed you don't import Ingectable from angular core although you use @Injectable decorator.

import { Injectable } from '@angular/core';

小开

use this import at the beginning

import {Observable} from "rxjs/Rx";