Angular 7: Best practices for handling nested responses with this.http.get

Currently following an instructional guide on Angular 7 and have a question regarding the correct method to retrieve a list of items if they are nested rather than at the top level:

List at Top Level (working)

[
  { id: 123, name: 'Name 123'},
  { id: 124, name: 'Name 124'},
  // ...
]

Nested List (not working)

{
  message: 'x items found.',
  data: [
    { id: 123, name: 'Name 123'},
    { id: 124, name: 'Name 124'},
    // ...
  ]
}

Service Integration

// ...
@Injectable({ providedIn: 'root' })
export class ItemService {
  private apiUrl = 'api/items'; 

  constructor(private http: HttpClient) {}

  getItems (): Observable<Item[]> {      
    // Facing an issue here:
    return this.http.get<Item[]>(this.apiUrl, {
      pathToItems: 'data' 
    });
  }
}

Component Implementation

// ...
this.itemService.getItems()
  .subscribe(items => this.items = items);

One approach could be to utilize subscribe() in the service and extract the contents of .data, but I believe there might be a simpler solution available. The objective is to maintain the return type as an array of Item.

Any suggestions or insights would be greatly appreciated.

Thank you!

Answer №1

If you're looking to manipulate data using RxJs, consider leveraging filters such as map or filter. This is one of the perks of working with RxJs and Observables - it allows you to pre-process your data before passing it along to your component.

Here's a quick example:

return this.http.get(ITEMS_URL).pipe(
  filter(response => response.filter(data => data.message === "SUCCEEDED")),
  map(response => response.map(data => data.items))
);

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