Firebase Firestore - OR query alternative

Question

In this question Firebase Firestore - OR query they said there is no OR query. This means I can\'t easily query for items that have an ID that is in an array I got earlier.

Answer 1

You could combine the Observables using rxjs;

orQuery(){

    const $one = this.afs.collection("items", ref => ref.where("itemId","==","1")).valueChanges();
    const $two = this.afs.collection("items", ref => ref.where("itemId","==","3")).valueChanges();

    return combineLatest($one,$two).pipe(
        map(([one, two]) => [...one, ...two])
    )
}

getOr(){
    this.orQuery().subscribe(data => console.log(data))
}