WriteDocUseCase<T extends Model> class

Writes (creates/updates) a single entity at WriteParams.docId.

Returns:

• Right(T) with the authoritative value returned by the repository.
• Left(ErrorItem) on failure.

Example:

void main() async {
  final RepositoryWsDatabase<UserModel> repo = MyRepo<UserModel>();
  final res = await WriteDocUseCase<UserModel>(repo)
      .call(WriteParams<UserModel>('u1', defaultUser));
  res.fold(
    (e) => print('write error: ${e.code}'),
    (u) => print('saved: ${u.id}'),
  );
}