Returning nested array from mongodb and native node driver

I have a document that's setup like this:

{
 _id : '',
 name : '',
 friends : [
    {'name' : ''},
    {'name' : ''},
    {'name' : ''} 
 ]
}

I want to select just the 'friends' array and get the array of objects to iterate through. However, when I do this:

this.collection.find({'_id' : _id}, {'friends' : 1}).toArray(function(err, res) {
    console.log(res);
});

This returns an array that looks like this:

[
  friends : [
      {'name' : ''},
      {'name' : ''},
      {'name' : ''} 
   ]
]

Ideally, it would only return:

[
    {'name' : ''},
    {'name' : ''},
    {'name' : ''} 
]

Is there a way to do this?

Thank you!