Observable.forkJoin() doesn't execute

Question

I have the following code:

//Loop: For each user ID/Role ID, get the data
userMeta.forEach((businessRole) => {
  Observable.forkJoin(
    af.database.obje         


        

Answer 1

I've faced a similar issue: I was creating a list of observables dynamically and I've noticed that forkjoin() never emits nor completes if the list of observables is empty whereas Promise.all() resolves with an empty list :

Observable.forkJoin([])
    .subscribe(() => console.log('do something here')); // This is never called

The workaround I've found is to check the length of the list and to not use this operator when it is empty.

return jobList.length ? Observable.forkJoin(jobList) : Observable.of([]);