toggle function

Future<bool> toggle({ String? path, DatabaseReference? ref, dynamic value, })

Toogle a node

If the node of the path does not exist, create it and return true. Warning, if the node exists, then remove it and return false.

value is the value to set. If it is null, then it will be set to true.

Returns true if the node is created, otherwise false.

Implementation

Future<bool> toggle({
  String? path,
  DatabaseReference? ref,
  dynamic value,
}) async {
  if (path == null && ref == null) {
    throw ArgumentError('path or ref must be not null');
  }

  if (path != null) {
    ref = FirebaseDatabase.instance.ref(path);
  }

  final snapshot = await ref!.get();

  if (snapshot.exists == false) {
    await ref.set(value ?? true);
    return true;
  } else {
    await ref.remove();
    return false;
  }
}