Complicated nested request in MongoDB

I have a collection with documents of this format:

{
        "_id" : ObjectId("51b1e27e31b1f4fe0700001b"),
        "proposals" : [
                {
                        "id" : 17,
                        "type" : "question",
                        "fr" : {nothing useful},
                        "en" : {nothing useful},
                        "vote_count" : 0,
                        "validate" : 0,
                        "username" : "username",
                        "voters" : [ ],
                        "creationDate" : ISODate("2013-07-25T08:32:40.328Z")
                }, 
                {other proposals of the same type}
         ]
},
{same format}

I'm trying to update the proposal matched by an ID that I receive, in the right parent. I have found a request on the Mongo cookbook that I used successfully, but on less complicated data format, and I can't make it works now. Here it is.

client.collection('games').update({_id: gameId, 'proposals.id': eventId, 'proposals.voters': {'$ne': user}}, {'$push': {'proposals.voters': user}, '$inc': {'proposals.vote_count': 1}, '$set': {'proposals.validate': 1}});

gameId and eventId are in the right format. If I use the query part of the update in a find(), I get the right game. But I'm struggling to see why my document isn't updated.

You must you $ operator to identify what position in array you want update. Your update command will be:

client.collection('games')
.update( 
    {
        _id: gameId, 
        'proposals.id': eventId, 
        'proposals.voters': {'$ne': user}
    }, 
    {
        '$push': {'proposals.$.voters': user},
        '$inc': {'proposals.$.vote_count': vote}, 
        '$set': {'proposals.$.validate': 1}
    }
);