private void GetAuthorRecommendations()
{
List <Guid> authorIds = new List <Guid>();
var allBookAuthors = _bookAuthorService.AsQueryable().ToList();
List <Author> authors = new List <Author>();
List <GroupingByAuthor> groupingByAuthors = new List <GroupingByAuthor>();
foreach (var bookId in _bookIds)
{
var bookAuthorId = allBookAuthors.Where(x => x.BookId == bookId).First().AuthorId;
var author = _authorService.AsQueryable().Where(x => x.Id == bookAuthorId).FirstOrDefault();
if (!authors.Contains(author))
{
authors.Add(author);
groupingByAuthors.Add(
new GroupingByAuthor
{
Id = author.Id,
AuthorName = author.FirstName + " " + author.LastName,
NumOfBooks = 1
});
}
else
{
groupingByAuthors.Where(x => x.Id == author.Id).FirstOrDefault().NumOfBooks++;
}
}
var mostReadOrViewedAuthorId = groupingByAuthors.OrderByDescending(x => x.NumOfBooks).First().Id;
var booksFromFavAuthor = _bookAuthorService
.AsQueryable()
.Include(x => x.Book)
.Where(x => x.AuthorId == mostReadOrViewedAuthorId)
.ToList();
foreach (var book in booksFromFavAuthor)
{
_booksFromFavAuthorUserHasNotYetRead.Add(book.Book);
}
foreach (var bookUserRead in _booksUserRead)
{
if (_booksFromFavAuthorUserHasNotYetRead.Contains(bookUserRead.Book))
{
_booksFromFavAuthorUserHasNotYetRead.Remove(bookUserRead.Book);
}
}
}
public ActionResult <IEnumerable <BookDto> > GetFiveBooksFromSameAuthor(Guid bookId)
{
var result = new List <BookDto>();
var openedBook = _bookService
.AsQueryable()
.Include(x => x.BookAuthors)
.FirstOrDefault();
if (openedBook is null)
{
return(BadRequest($"Book with id : {bookId} does not exist!"));
}
var authorId = openedBook.BookAuthors.FirstOrDefault().AuthorId;
var idsOfAuthorsBooks = _bookAuthorService
.AsQueryable()
.Where(x => x.AuthorId == authorId)
.Select(x => x.BookId)
.ToList();
idsOfAuthorsBooks.Shuffle();
foreach (var id in idsOfAuthorsBooks.Take(5))
{
var book = _bookService
.AsQueryable()
.Include(x => x.BookAuthors)
.Include(x => x.Publisher)
.Include(x => x.Genre)
.FirstOrDefault(x => x.Id == id);
result.Add(MapToBookDto(book));
}
return(Ok(result));
}
public ActionResult <BookAuthor> Get(Guid id)
{
var item = _bookAuthorService.AsQueryable()
.Where(x => x.Id == id)
.FirstOrDefault();
if (item is null)
{
return(NoContent());
}
return(Ok(item));
}