public void UpdatePrintingEdition(PrintingEditionModel printingEdition) { _validator.ValidatePrintingEdition(printingEdition); var dbPrintingEdition = _printingEditionRepository.GetById(printingEdition.Id); if (dbPrintingEdition is null) { throw new CustomApiException(HttpStatusCode.BadRequest, Constants.PRINTINGEDITIONNOTFOUNDERROR); } _mapper.Map(printingEdition, dbPrintingEdition); var authorFilter = new AuthorFilterModel { EditionAuthors = printingEdition.Authors }; var authors = _authorRepository.GetAll(authorFilter); dbPrintingEdition.Authors.Clear(); var dbAuthors = dbPrintingEdition.Authors.ToList(); dbAuthors.AddRange(authors); dbPrintingEdition.Authors = dbAuthors; _printingEditionRepository.Update(dbPrintingEdition); }