I have a stream within flutter that batch requests items from a firestore database, merges them and returns the merge. The code is as follows.
Stream<List<Memo>> get memos {
// list of streams to be merged
List<Stream<List<Memo>>> streams = [];
// get list of friend userids
Firestore.instance.collection("users").document(userid).collection("friends").snapshots().map(_snapshotToStringList).listen((friends){ // add where confirmed == true to this
// break list into chunks of ten
for (var i = 0; i < friends.length; i++) {
// query post list for each chunk of 10 and add to stream list
streams.add(Firestore.instance.collection("memos").where("userid", isEqualTo: friends.sublist(i, i + 1)).snapshots().map(_snapshotToMemoList));
}
print(streams);
// merge steam list
});
print(streams);
return StreamGroup.merge(streams);
}
The issue is that the function terminates before the stream returns the necessary values and adds them to the list of streams to be merged and returned resulting in a null return. I cannot put an await statement within a stream function so I am unsure on how to wait for the inner stream to complete before the final return. Any and all advice in fixing this issue is appreciated.
