def feed_ratings(book_id):
    off = request.args.get("offset") or 0
    entries, __, pagination = calibre_db.fill_indexpage((int(off) / (int(config.config_books_per_page)) + 1), 0,
                                                        db.Books,
                                                        db.Books.ratings.any(db.Ratings.id == book_id),
                                                        [db.Books.timestamp.desc()])
    return render_xml_template('feed.xml', entries=entries, pagination=pagination)