Question 119843 in Firebase Question posted in
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Firebase – flutter firestore: how to get a query of documents

Im trying to get a list of user objects from firestore through a query. My current attempt looks like this:

List<User> getDiscoveryUsers(
    String userId,
  ) async {
    Query<Object?> query =
        userCollection.where('finishedOnboarding', isEqualTo: true).limit(10);

    var collection = await query.get();
    //get the users list from query snapshot
    var users = collection.docs.map((doc) => User.fromSnapshot(doc)).toList();

    return users;
  }

However I am getting the error:

Functions marked 'async' must have a return type assignable to 'Future'.
Try fixing the return type of the function, or removing the modifier 'async' from the function body.

I know there are a few similar questions on stack overflow, but i just cant seem to get this to work. Anyone know whats going on?

Thanks!

Tags:

2

Answers


  1. 0

    Just change the return type of your function from List<User> to Future<List<User>>.

    Happy coding:)

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  2. 0

    your return type should be Future and must wait with await when running query on firestore.

    Future<List<User>> getDiscoveryUsers(
    String userId,
  ) async {
    Query<Object?> query =
        userCollection.where('finishedOnboarding', isEqualTo: true).limit(10);

    var collection = await query.get();
    //get the users list from query snapshot
    var users = collection.docs.map((doc) => User.fromSnapshot(doc)).toList();

    return users;
  }
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