Nodejs, MongoDB (node-mongodb-native). FindAndModify finds doc, but doesn't update it

I'm trying to use findAndModify operation to find and update doc.

Query: {'socket_id': data.socket_id, 'weapons.type': selectedWeapon, 'battleWeapons.type':selectedWeapon}
Update: {'$inc':{'weapons.$.nums':-1, 'battleWeapons.$.nums':-1}}

I got Doc in my callback function (so it found by query), but there's no changes in MongoDB doc. Same command works fine in mongo console. It changes everything I need. What am I doing wrong?

So the whole command looks like:

db.collection('users', function (err, collection) {
    var condition = {'socket_id': data.socket_id, 'weapons.type': selectedWeapon, 'battleWeapons.type':selectedWeapon},
    update = {'$inc':{'weapons.$.nums':-1, 'battleWeapons.$.nums':-1}};
    collection.findAndModify(condition, [['_id','asc']], update, {'new': true}, function (err, item) {...
})});