public Book GetBookById(int?Id, BooksDBContext context)
{
if (!Id.HasValue)
{
return(null);
}
return(context.Books.Include(b => b.Reviews).FirstOrDefault(b => b.Id == Id.Value));
}
public IEnumerable <Book> GetBooks()
{
using (var context = new BooksDBContext(dbOptions))
{
return(context.Books
.Include(b => b.Reviews)
.ToList());
}
}
public Book GetBookById(int?Id)
{
using (var context = new BooksDBContext(dbOptions))
{
if (!Id.HasValue)
{
return(null);
}
return(context.Books.Include(b => b.Reviews).FirstOrDefault(b => b.Id == Id.Value));
}
}
public BookReview UpdateBookReview(BookReview bookReview)
{
using (var context = new BooksDBContext(dbOptions))
{
var bookReviewDb = GetBookReviewById(bookReview.Id, context);
bookReviewDb.Title = bookReview.Title;
bookReviewDb.Review = bookReview.Review;
bookReviewDb.Rating = bookReview.Rating;
context.SaveChanges();
return(bookReviewDb);
}
}
public void DeleteBook(int Id)
{
using (var context = new BooksDBContext(dbOptions))
{
var book = context.Books.FirstOrDefault(b => b.Id == Id);
if (book == null)
{
throw new DataException($"No book found with id {Id}");
}
context.Books.Remove(book);
context.SaveChanges();
}
}
public void DeleteBookReview(int id)
{
using (var context = new BooksDBContext(dbOptions))
{
BookReview bookReview = GetBookReviewById(id);
if (bookReview == null)
{
throw new DataException($"No BookReview found with id {id}");
}
context.BookReviews.Remove(bookReview);
context.SaveChanges();
}
}
public Book UpsertBook(Book book)
{
using (var context = new BooksDBContext(dbOptions))
{
if (book.Id <= 0)
{
context.Books.Add(book);
}
else
{
context.Entry(book).State = EntityState.Modified;
}
context.SaveChanges();
return(book);
}
}
public BookReview AddReviewToBook(int id, BookReview bookReview)
{
using (var context = new BooksDBContext(dbOptions))
{
if (bookReview.Id > 0 || bookReview.Book != null)
{
throw new DataException("The bookreview id must be 0 for new reviews");
}
var book = GetBookById(id, context);
if (book == null)
{
throw new DataException($"No book found with id {id}");
}
book.Reviews.Add(bookReview);
context.SaveChanges();
return(bookReview);
}
}
public BookRepository(BooksDBContext context)
{
this.context = context;
}
