MongoDb driver queryable interface integration with AutoMapper

MongoDbExtensions.cs

public static class MongoDbExtensions
{
    public static IMongoQueryable<TDestination> ProjectTo<TSource, TDestination>(this IQueryable<TSource> query, AutoMapper.IMapper autoMapper) =>
        query.ProjectTo<BookListDTO>(autoMapper.ConfigurationProvider) as IMongoQueryable<TDestination>;
}

// usage ...
private readonly IMongoCollection<Book> _books;
private readonly IMapper _mapper;
// ...
_books
            .AsQueryable()
            .Skip((page - 1) * pageSize)
            .Take(pageSize)
            .ProjectTo<Book, BookListDTO>(_mapper)
            .ToListAsync();