toDatastoreKey method

Implementation

@override
ds.Key toDatastoreKey(Key dbKey) {
  var elements = <ds.KeyElement>[];
  var currentKey = dbKey;
  while (!currentKey.isEmpty) {
    var id = currentKey.id;

    var modelDescription = _modelDescriptionForType(currentKey.type)!;
    var kind = modelDescription.kindName(this);

    var useIntegerId = modelDescription.useIntegerId;

    if (useIntegerId && id != null && id is! int) {
      throw ArgumentError('Expected an integer id property but '
          'id was of type ${id.runtimeType}');
    }
    if (!useIntegerId && (id != null && id is! String)) {
      throw ArgumentError('Expected a string id property but '
          'id was of type ${id.runtimeType}');
    }

    elements.add(ds.KeyElement(kind, id));
    currentKey = currentKey.parent!;
  }
  var partition = currentKey._parent as Partition;
  return ds.Key(elements.reversed.toList(),
      partition: ds.Partition(partition.namespace));
}