public async Task <GetAuthorResponseViewModel> GetAuthor(long authorId)
{
Author author = await _authorRepository.GetAsync(authorId);
if (author == null)
{
throw new NotFoundException("Author with provided id was not found.");
}
GetAuthorResponseViewModel getAuthorResponseViewModel = _mapper.Map <Author, GetAuthorResponseViewModel>(author);
IEnumerable <Book> authorBooks = await _bookRepository.GetBooksByAuthorIdAsync(authorId);
if (authorBooks == null || authorBooks.Count() == 0)
{
return(getAuthorResponseViewModel);
}
IEnumerable <long> bookIdList = authorBooks.Select(b => b.Id);
IEnumerable <BookGenre> booksGenres = await _bookGenreRepository.GetBooksGenresByBookIdListAsync(bookIdList);
IEnumerable <IGrouping <long, BookGenre> > groupedGenres = booksGenres.GroupBy(bg => bg.BookId);
getAuthorResponseViewModel.Books = authorBooks.Select(b =>
{
IEnumerable <Genre> genres = groupedGenres.Where(g => g.Key == b.Id).SelectMany(g => g.Select(bg => bg.Genre));
var book = new BookViewModelItem
{
Id = b.Id,
Title = b.Title,
PublicationYear = b.PublicationYear,
Genres = _mapper.Map <IEnumerable <Genre>, IEnumerable <GenreViewModelItem> >(genres)
};
return(book);
}).ToList();
return(getAuthorResponseViewModel);
}
