What steps can I take to resolve the issue of my data not being transferred from the service to the module

Attempting to retrieve data from an API using a service and then logging it within a module that will later display it in a list. The variable appears in the console.log in the service, but not when attempting to log it in the module

I have used this same setup with Ionic before and assumed Angular would function similarly, but that seems not to be the case here. I have already added error handling to the .subscribe function, yet no errors are being displayed. I am at a loss as to where to troubleshoot next.

api.service.ts

getPlacesData(): any {
    let result = this.http.get(`${this.apiUrl}/places`, this.httpOptions).pipe(
      map(response => {
        console.log(response['data']);
        response['data'];
      })
    );
    return result;
  }
}

test-dashboard.component.ts

constructor(private breakpointObserver: BreakpointObserver, private apiService: ApiService) {}

  getPlacesData() {
    this.apiService.getPlacesData().subscribe(
      (placesData: Observable<any>) => {
        console.log(placesData);
        this.placesData = placesData;
        console.log(this.placesData);
      },
      (error: string) => {
        console.log('Received an errror: ' + error);
      }
    );
  }

  ngOnInit() {
    this.getPlacesData();
  }
}

Expecting the second and third console.log statements to output the same as the first one, but instead of the desired array:

(15) [{…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}]

Answer №1

The main issue lies in attempting to synchronously return a value when dealing with Angular https requests, which are asynchronous by nature. It's important to handle them accordingly. Modify your function to return an Observable and utilize the async pipe in your HTML template for accessing the data.

retrieveData(): Observable<Places[]> {
    return this.http.get<Places[]>(`${this.apiUrl}/places`, this.httpOptions).pipe(
      map(response => response['data']),
    );
  }
}

Answer №2

Consider implementing the following solution

grabData(): any {
return this.apiService.fetch(this.terminateSurveyUrl, terminateSurveyReqObj)
  .pipe(
    transform((response:any) => {
      console.log('response',response);
      return response.data;
    }),
  )
}

Let me know if you have any questions!

Answer №3

In order to retrieve information, you must include a data return statement within your map function.

  map(response => {
    console.log(response['data']);
    return response['data'];
  })

Alternatively,

  map(response => response['data'])

Additionally, the type of value in your subscription should be an Array instead of an Observable.

(placesData: Array<any>)

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