getAll method
Implementation
Future<List<V?>> getAll(List<String> keys, [Transaction? txn]) async {
if (!keys.any((key) => !_cache.containsKey(key))) {
return keys.map((key) => _cache[key]).toList();
}
txn ??= boxCollection._db.transaction(name, 'readonly');
final store = txn.objectStore(name);
final list = await Future.wait(keys.map((key) => store.getObject(key)));
for (var i = 0; i < keys.length; i++) {
_cache[keys[i]] = list[i] as V?;
}
return list.cast<V?>();
}