csharp
public BookController(BookRequestHandler requestHandler) : ControllerBase
{
    public async Task<IActionResult> GetBook(int bookId)
    {
        var model = await requestHandler.GetBook(bookId);
        return model is not null ? Ok(model)
            : NotFound();
    }
}

csharp
public class BookRequestHandler(IBookStore store)
{
    public async Task<BookViewModel> GetBook(int id)
    {
        var dbModel = await store.GetById(id, Projections.BookDetailModel);
        return dbModel.ToBookViewModel();
    }
}

csharp
public class BookStore(IEFCoreScopeProvider<BookStoreContext> scopeProvider)
{
    public async Task<T> GetById<T>(int id, Func<IQueryable<BookDTO>, IQueryable<T>> projection)
    {
        using var scope = scopeProvider.CreateScope();
        var result = await scope.ExecuteWithContextAsync(context =>
        {
            var q = context.Books.Where(e => e.Id == id);
            return projection(q).FirstOrDefaultAsync();
        });
        scope.Complete();
        return result;
    }
}

csharp
public static class Projections
{
    public static IQueryable<BookDetailProjection> BookDetailModel(IQueryable<BookDTO> query)
        => query.AsNoTracking()
        .Select(e => new BookDetailModel(e.Id, e.Title, e.Description));
}