I've been trying to think of a good way to cancel previous HTTP request when new requests are fired, for which I would normally use the switchMap operator. However, due to my request being not bound to a button click or any other event, but is instead proxied to the NGXS store in an action dispatch, I can't really think of how I would do that.
Consider the following setup:
In the app.component.ts, you'd have something like:
@Component({
selector: 'app-component',
template: '<div (click)="sendRequestForData()">Click me!</div>'
})
export class AppComponent {
//...some selectors
constructor(private store: Store) {}
sendRequestForData() {
this.store.dispatch(new Fetch());
}
//...
}
Further, there would be an action in store set up something like this:
@Action(Fetch)
private fetchFromDatabase(ctx: StateContext<StateModel>) {
this.http.get('url').pipe(
catchError(err => {
ctx.dispatch(new FetchError());
return of(false);
}),
tap(data => {
if(typeof data !== 'boolean') {
ctx.dispatch(new FetchSuccess());
}
})).subscribe();
)
This setup in the fetching action has not source observable (as in something acting like the button click observable) to really "switch" from in order to even use a switchMap, so how would I use a switchMap in this setup?
