angular - kalle en tjeneste angular2-feil 'Egenskapen 'then' finnes ikke på typen 'Subscription'

Jeg prøver å kalle tjenesten fra min login.ts, men jeg får stadig forskjellige feil. Her er koden min

login.ts

import { Component } from '@angular/core';
import { Auth, User } from '@ionic/cloud-angular';
import { NavController } from 'ionic-angular';
import { Storage } from '@ionic/storage';
import { TabsPage } from '../tabs/tabs';
import { AuthService } from '../../services/auth/auth.service';
import {Observable} from 'rxjs/Rx';


@Component({
  templateUrl: 'login.html'
})

export class LoginPage {
    authType: string = "login";
    error: string;
    storage: Storage = new Storage();

  constructor(public auth: Auth, public user: User, public navCtrl: NavController, public authService: AuthService) {}

  facebookLogin() {
    this.auth.login('facebook').then((success) => {
        this.authService.signup(this.user.social.facebook).then((success) => {

        });
    });

  }
}

auth.service.ts

import { Storage } from '@ionic/storage';
import { AuthHttp, JwtHelper, tokenNotExpired } from 'angular2-jwt';
import { Injectable, NgZone } from '@angular/core';
import { Observable } from 'rxjs/Rx';
import { Http, Headers } from 'angular2/http';

@Injectable()
export class AuthService {

  jwtHelper: JwtHelper = new JwtHelper();
  // contentHeader = new Headers({"Content-Type": "application/json"});
  storage: Storage = new Storage();
  refreshSubscription: any;
  user: Object;
  zoneImpl: NgZone;
  idToken: string;
  error: string;

  constructor(private authHttp: AuthHttp, zone: NgZone) {
    this.zoneImpl = zone;
    // Check if there is a profile saved in local storage
    this.storage.get('profile').then(profile => {
      this.user = JSON.parse(profile);
    }).catch(error => {
      console.log(error);
    });

    this.storage.get('id_token').then(token => {
      this.idToken = token;
    });
  }

  public authenticated() {
    return tokenNotExpired('id_token', this.idToken);
  }

  public signup(params) {
    var url = 'http://127:0.0.1:3000/api/v1/register';
    return this.authHttp.post(url, JSON.stringify(params))
        .map(res => res.json())
        .subscribe(
          data => {this.storage.set('id_token', data.token)},
          err => this.error = err
        );
  }
}

Så basically det jeg ønsker er at når facebookLogin() blir klikket, går det til auth.service.ts og henter singup()-metoden som returnerer verdien.

Men jeg får stadig en Property 'then' does not exist on type 'Subscription'.

Hva betyr dette, og hvordan løser jeg dette?

Svar #1

Endre subscribe til toPromise() (ikke glem å importere toPromise)

  public signup(params) {
    var url = 'http://127:0.0.1:3000/api/v1/register';
    return this.authHttp.post(url, JSON.stringify(params))
        .map(res => res.json())
        .toPromise(
          data => {this.storage.set('id_token', data.token)},
        );
  }

eller til .map() og deretter bruke subscribe() i stedet for then() på kallstedet.

 public signup(params) {
    var url = 'http://127:0.0.1:3000/api/v1/register';
    return this.authHttp.post(url, JSON.stringify(params))
        .map(res => {
          let data = res.json();
          this.storage.set('id_token', data.token);
          return data;
        });
  }

  facebookLogin() {
    this.auth.login('facebook').then((success) => {
        this.authService.signup(this.user.social.facebook).subscribe((success) => {

        });
    });

  }

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