watchRelated<R extends DatumEntityInterface> method

Stream<List<R>>? watchRelated<R extends DatumEntityInterface>(T parent, String relationName)

Reactively watches related entities for a given parent entity (the internals behind the deprecated DatumManager.watchRelated).

Implementation

Stream<List<R>>? watchRelated<R extends DatumEntityInterface>(
  T parent,
  String relationName,
) {
  if (parent is RelationalDatumEntity) {
    final relation = parent.relations[relationName];
    if (relation == null) {
      throw ArgumentError(
        'Relation "$relationName" is not defined on entity type ${parent.runtimeType}.',
      );
    }
  } else {
    throw ArgumentError(
      'The parent entity must be a RelationalDatumEntity to watch relations.',
    );
  }

  final relatedManager = Datum.manager<R>();

  return manager.localAdapter.watchRelated(
    parent,
    relationName,
    relatedManager.localAdapter,
  );
}