i'm getting data from APIs and I'm inicializing the data like this:
export class ForumComponent implements OnInit {
@Input() id_foro: number = 3;
nombre: string = '';
desc: string = ''
foro!: Forum;
constructor(private forumService: ForumService) { }
ngOnInit(): void {
this.forumService.getById(this.id_foro).subscribe((data: Forum) => {
this.foro = data;
});
}
}
How can I do that like this?
forum: Forum = this.forumService.getById(this.id_foro).subscribe();
GetById function:
getById(id: number): Observable<Forum> {
return this.httpClient.get<Forum[]>(`http://localhost:3000/forum/${id}`)
.pipe(map((response: Forum[]) => response[0]));
}
CodePudding user response:
getById
is already returning an observable so there is no need to subscribe. Just react to the response using | async
pipe.
I'd suggest to remove the !
unless you are 100% sure, that there always will be a value (thought I doubt this).
Let's add $
to indicate that it is an observable (it's just a way to name the variable, nothing else fancy).
foro$: Observable<Forum> = this.forumService.getById(this.id_foro);
<div>{{ foro$ | async }}</div>
Edit to access the object from the observable
<div *ngIf="(foro$ | async)?.nombre">{{ (foro$ | async)?.nombre }}</div>
<ng-container *ngIf="foro$ | async as forum">
<div *ngFor="let prop of forum | keyvalue">
Key: <b>{{prop.key}}</b> and Value: <b>{{prop.value}}</b>
</div>
</ng-container>