Observable and nested list in object

Question

I am doing my first steps with RxJava und Retrofit. I have a rest API which returns an Observable<Department> . The class Department has a nested list of Team objects. How can I get an Observable<Team> which delivers all teams of the nested list from the Observable<Department> ?

I tried playing around with map() and switchMap() but I still can't get the desired Observable<Team> .

My idea is to subscribe to the Observable<Team> and for every delivered team I trigger some update logic.

Answer 1

You can just create a pipeline using map to get the inner values and then flatMapIterable to unwrap the arrays.

Suppose dept$ is your Observable<Department>

dept$
  .map(d -> d.getTeam())
  .flatMapIterable(teamArr -> teamArr)
  .doOnNext(System.out::println)
  .subscribe();