public async Task <OperationalResult> AddAsync(Operational <BookModel> operational, CancellationToken cancellationToken = default)
{
var model = operational.Parameter;
var entity = _mapper.Map <BookModel, Book>(model);
var result = await _bookStore.AddAsync(entity, cancellationToken);
return(result ? OperationalResult.Ok() : OperationalResult.Failed(""));
}