Angular Return Observable from subscription

Question

I'm trying to return an Observable of object(s), depending on an other service call, here is a simple example:

public getMyObject(): Observalbe<MyObject> {
    let myObject;
    this.isFeautreEnabled().subscribe(isEnabled=> {
        if (isEnabled) {
            myObject = this.http.get<MyObject>('domain/path'); 
        } else {
            myObject = of();
        }
    })
    return myObject;
}

So I want to return MyObject from the service, if the feature is enabled (async call also), and something else otherwise (null in this case).

This doesn't work, because isFeatureEnabled is async as well.

Note that I can't change the method signature to async, because it would change the return type as well.

MoxxiManagarm · Accepted Answer · 2021-01-11 11:30:08Z

1

Use switchMap operator.

public getMyObject(): Observalbe<MyObject> {
    return this.isFeautreEnabled().pipe(
      switchMap(isEnabled => isEnabled ? this.http.get<MyObject>('domain/path') : of()),
    );
}

answered Jan 11, 2021 at 11:30

MoxxiManagarm

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