mongodb embedded array

sortedembed.js

var db = require('../database');

//create index on array score field, and members.value
db.client.collection('test').ensureIndex({"_key": 1, "members.score": 1}, {background:true},function(err) {
	console.log(err);
});

// this is basically getSortedSetRange('experiment', 0, 3);
var pipeline = [
	{$match: {_key: "experiment"}},
	{$unwind: "$members"},
	{$sort: {"members.score": -1}},
	{$skip: 0},
	{$limit: 3},
	{$project: { _id: 0, value: '$members.value' }}
];

db.client.collection('test').aggregate(pipeline, {explain: false}, function(err, data) {
	if (err) {
		return res.json(500, err.message);
	}

	res.json(data);
});


// this is sortedSetAdd('experiement', 8, 'item4');
// except it doesnt update existing elements when its called again with a different score :(

db.client.collection('test').update(
	{
		_key : "experiment",
		"members.value" : {$ne : "item4" }
	},
	{
		$addToSet : {"members" : {'value' : "item4" , 'score': 8 }}
	},
	{
		upsert:false, w:1
	}, function(err) {
		console.log(err);
	});