CODEWITHSUNDEEP
firebasefluttergoogle-cloud-firestore
Leena D.
Leena D.

Reputation: 49

Flutter Firebase Reading Data

I have a variable called _memories and I want to update it to the content that is returned from the Firestore database in the .then() and then return it. I know the content is correct in from using the print statement, but neither return statement is returning the updated _memories. It's returning the {'title': 'myTitle'}. Anyone know how to fix this?

List getUserMemories() {
  User? currentUser = AuthenticationService().getUser();
  if (currentUser == null) {
    throw Exception('currentUser is null');
  }
  CollectionReference memories = _firestore.collection('memories');
  List _memories = [
    {'title': 'myTitle'}
  ];
  memories
      .where('user_email', isEqualTo: currentUser.email)
      .get()
      .then((QuerySnapshot querySnapshot) async {
           _memories = await querySnapshot.docs.map((e) => e.data()).toList();
           print("In FirestoreService: $_memories");
           return _memories;
      })
      .catchError((error) => print("Failed to obtain user's memories: $error"));
  
  return _memories;
}

Upvotes: 1

Views: 159

Answers (1)

Peter Koltai
Peter Koltai

Reputation: 9744

Try to convert getUserMemories to an async function and use await where you call it:

List getUserMemories() async {
  User? currentUser = AuthenticationService().getUser();
  if (currentUser == null) {
    throw Exception('currentUser is null');
  }
  CollectionReference memories = _firestore.collection('memories');
  List _memories = [
    {'title': 'myTitle'}
  ];
  try {
    final result = await memories
      .where('user_email', isEqualTo: currentUser.email)
      .get();
    _memories = result.docs.map((e) => e.data()).toList();
    print("In FirestoreService: $_memories");
  } catch (e) {
     print("Failed to obtain user's memories: $e"));
  }  
  return _memories;
}

Upvotes: 1

Related Questions