gistfile1.txt

exports.genre = function(req, res, next) {
    var genre_id = req.param('id'),
        start = req.param('start', 0),
        num = 12;

    client.smembers('genre:'+genre_id+':movies', function(err, movie_ids){
        var movies = [], end = start + num; 

        if (end > movie_ids.length) end = movie_ids.length;
        movie_ids = movie_ids.slice(start, end);

        async.forEachSeries(movie_ids, function(movie_id, done) {
            client.hgetall('movie:'+movie_id+':data', function(err, movie) {
                if (err) return done(err);
                movies.push(movie);
                done();
            }, function(err) {
                if (err) return next(err);
                res.json(movies);
            });
        });
    });
}