Update array in mongodDB collection

Question

Building an API with node/express. I'm having problem updating an array inside a collection with mongoDB. I just want to add a reference id to the useritems array in the collection user.

User looks like this:

[
    {
        fbname: "name.name",
        email: "name.name@hotmail.com",
        username: "mr.name",
        useritems: [ObjectId("51e101df2914931e7f000003"), ObjectId("51e101df2914931e7f000005"), ObjectId("51cd42ba9007d30000000001")]
    }];

In my server.js:

var express = require('express'),
    item = require('./routes/items');

var app = express();

app.configure(function () {
    app.use(express.logger('dev'));    
    app.use(express.bodyParser());
});

app.put('/users/:userId/item/:itemId/add', item.addUserItem); 

query:

exports.addUserItem = function(req, res) {
    var user = req.params.userId; 
    var item = req.params.itemId; 
    console.log('Updating useritem for user: ' + user);
    console.log("item: ", item);

    db.collection('users', function(err, collection) {

        collection.update({'_id':new BSON.ObjectID(user)}, {$addToSet: { useritems: item}}); 

    });
}

When i try it with curl nothing happens and i get the error: (52) Empty reply from server, from curl

Curl:

curl -i -X PUT -H 'Content-Type: applicatio/json' http://127.0.0.1:3000/users/51e6a1116074a10c9c000007/item/51e6a1116074a10c9c000006/add

Answer 1

Try this:

collection.update({'_id':new BSON.ObjectID(user)}, {$addToSet: { useritems: item}}, true, function(err, result){
    res.json(200, result);
});