isExistingItem method

@protected Future<bool> isExistingItem(T item)

Checks if an item with the given ID exists in the local database. This is a placeholder and should be overridden by concrete repositories.

Implementation

@protected
Future<bool> isExistingItem(T item) async {
  // Default implementation, should be overridden.
  // For safety, assume item doesn't exist if not overridden,
  // to avoid accidental updates if create was intended.
  // However, a more robust approach is to require override or have a clear
  // contract on how newness is determined (e.g., model has an isNew flag).
  // For now, let's log and return false.
  log.warning(
    'isExistingItem() not implemented for $T with id ${item.id}, '
    'assuming false (new item).',
  );
  final existing = await fetchFromLocal(item.id, queryParams: null);
  return existing != null;
}