public async Task <ResponseBookPreviewViewModel> GetBooks(RequestGetBookViewModel requestViewModel)
{
RequestGetBooksModel requestModel = _mapper.Map <RequestGetBooksModel>(requestViewModel);
List <Book> books = await _bookRepository.GetByFilters(requestModel);
ResponseBookPreviewViewModel result = await GetMappedBooks(books, requestModel);
return(result);
}
public async Task <List <Book> > GetByFilters(RequestGetBooksModel requestModel)
{
Expression <Func <Book, bool> > expression = null;
List <Book> books;
if (requestModel.PrintingEditionTypes.Count == default(int))
{
expression = book => book.Price >= requestModel.MinPrice && book.Price <= requestModel.MaxPrice;
}
if (requestModel.PrintingEditionTypes.Count != default(int))
{
expression = book => book.Price >= requestModel.MinPrice && book.Price <= requestModel.MaxPrice && requestModel.PrintingEditionTypes.Contains(book.Category);
}
books = await _data.Books.Where(expression).Skip(requestModel.Index).Take(requestModel.Count).ToListAsync();
return(books);
}
private async Task <ResponseBookPreviewViewModel> GetMappedBooks(List <Book> books, RequestGetBooksModel requestModel)
{
List <int> booksIds = books.Select(book => book.Id).ToList();
List <AuthorBooks> authorBooks = await _authorBooksRepository.GetByBooksIds(booksIds);
List <int> authorsIds = authorBooks.Select(item => item.AuthorId).Distinct().ToList();
List <Author> authors = await _authorRepository.GetAuthorsByIds(authorsIds);
ResponseBookPreviewViewModel result = await MapBookToPreviewViewModel(books, authorBooks, authors);
result.TotalCount = await _bookRepository.GetTotalCount(requestModel);
return(result);
}
