Property 'then' is missing' Error when calling angular resolve

Question

I am using Angular resolver to get data before template get load. But I am getting an error. Here is my resolver code:

import 'rxjs/add/operator/map';
import 'rxjs/add/operator/take';
import { Injectable } from '@angular/core';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/fromPromise';

import { Router, Resolve, RouterStateSnapshot,ActivatedRouteSnapshot } from '@angular/router';

import { ApiService } from './api.service';

@Injectable()
export class ServiceResolve implements Resolve<any> {
  constructor(private apiservices: ApiService, private router: Router) {}

  resolve(route: ActivatedRouteSnapshot): Observable<any> {
    let JsonVal = JSON.parse(localStorage.getItem('RegistrationSteps'));
    let postData = {
      'token': JsonVal.auth_token
    }
    let url = 'getUserDetails';
    return Observable.fromPromise(this.apiservices.getUserDetailsByToken(postData,url));

  }
}

Here is my service code:

 getUserDetailsByToken(data,url){
    let headers = new Headers();
    return this.http.post(this.base_url+url,data).map(ret=>ret.json());
  }

Here is how I am trying to get data in component:

let userData = this.route.snapshot.data['userdata'];
console.log(userData,'sssss');

here is how my route look like:

{path:'signup',component:VendorRegistrationComponent,resolve:{userdata:ServiceResolve}},

This is the error I am getting:

error TS2345: Argument of type 'Observable' is not assignable to parameter of type 'PromiseLike'. Property 'then' is missing in type 'Observable'.

Answer 1

It happen because this

return this.http.post(this.base_url+url,data).map(ret=>ret.json());

Will return Observable, but you are trying to read as Promise Observable.fromPromise(...) , so, just change it to return this.apiservices.getUserDetailsByToken(postData,url); and everything will be ok.