private void UpdateAuthorRelationship(int bookCod, List <Author> newAuthors, List <Author> oldAuthors)
{
if (bookCod <= 0)
{
return;
}
List <Author> authorsToAdd = newAuthors
.Where(n => !oldAuthors
.Any(o => o.AuthorCod == n.AuthorCod))
.ToList();
if (authorsToAdd.Any())
{
_authorRepository.AddManyRelations(bookCod, authorsToAdd);
}
List <Author> authorsToRemove = oldAuthors
.Where(o => !newAuthors
.Any(n => n.AuthorCod == o.AuthorCod))
.ToList();
if (authorsToRemove.Any())
{
_authorRepository.DeleteManyRelations(bookCod, authorsToRemove);
}
}