Recent searches
Search options
Administered by:
To wait for a document to be created in Firestore by an async process, don't do this:
final cred = await auth.signInAnonymously();
Future.delayed(Duration(seconds: 15); // 
final doc = await firestore.doc(cred.user!.uid).getDoc();
That 15s wait will always be used, even when document creation takes much less time.
Instead listen to the snapshots() and convert that to a Future of the first document:
final cred = await auth.signInAnonymously();
final doc = await waitForDoc(firestore.doc(cred.user!.uid));
Full code (including of the waitForDoc helper function) and more on http://puf.io/posts/waiting-for-firestore-to-create-a-document and https://stackoverflow.com/a/78827418
Thanks to help from Luke Pighetti (
) on Twitter, waitForDocument is now down to this:
Future<DocumentSnapshot> waitForDocument(DocumentReference ref) {
return ref.snapshots().firstWhere((snapshot) => snapshot.exists);
}
