Firestore: Invalid document reference. Document references must have an even number of segments,

Question

I have a futter app and want to add items favorite by the user in a separate collection "userFavorites" which will store all favorite items depending on the current user uid by doing so:

Future getCurrentUser() async {
    final FirebaseUser user = await FirebaseAuth.instance.currentUser();
    final uid = user.uid;
    return uid.toString();
    }

    Future<void> toggleFavoriteStatus() async{

    var userId = await getCurrentUser();

    final oldStatus = isFavorite;
    isFavorite = !isFavorite;
    notifyListeners();
    try{
     await Firestore.instance.collection("userFavorites/$userId").document(id).updateData({
           'isFavorite': isFavorite,
         });
    }catch(error){
      _setFavValue(oldStatus);
     }
}

But I receive this error when I try to favorite any item:

Invalid document reference. Document references must have an even number of segments, but userFavorites/FRbYxmNpSBcda6XOrQUjukvFvVb2/q7eLxtZfhG3g6Pd1bYY4 has 3
E/MethodChannel#plugins.flutter.io/cloud_firestore(14551):  at com.google.firebase.firestore.DocumentReference.forPath(com.google.firebase:firebase-firestore@@21.3.0:80)

Answer 1

I ran into this problem using a doc reference & instead of using [document_reference].path I accessed it using the ID: [document_reference].id and that solved it for me.