Dependencies

MongoDB - http://www.mongodb.org/
sleepy.mongoose - https://github.com/kchodorow/sleepy.mongoose


MongoDB indexes

use foos
db.player.ensureIndex({name:1},{unique:true});


Interesting queries

// count goals per position
var map = function() {
 for (s in this.scores) emit(this.scores[s].position.substr(1),1);
}
var reduce = function(key, values) {
 return values.length;
}
db.game.mapReduce(map, reduce, {out:{inline:1}});