watch method

@override DelayedStateNotifier<E?> watch()

Returns a StateNotifier which emits the latest value of this BelongsTo relationship.

Implementation

@override
DelayedStateNotifier<E?> watch() {
  return _graphEvents.where((e) => e.isNotEmpty).map((e) {
    return [DataGraphEventType.removeNode, DataGraphEventType.removeEdge]
            .contains(e.last.type)
        ? null
        : value;
  });
}