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Modification result of Mongoose object does not work

Possible duplicate:
Why you cannot change the data returned by Mongoose Query (for example: findById)

First I make a request in mongoDB, I get all the correct results, but only a small modification of the object literal does not work. What I'm trying to do is add a new field to the comments. I tried using the DBref method, but it did not work, so I make 2 queries.

var query = Rss.findOne({ _id: itemId});
query.exec(function(err, feed) {
  if (!err && feed.comments) {
    console.log(feed.comments.length);
    for (var index in feed.comments) {
      var author = feed.comments[index].author;
      if (author !== undefined) {
        User.findById(author, function(err, user) {

          /**Problem is here **/
          feed.comments[index].name = 'Some random field';
          console.log('Added new field' + util.inspect(feed));

        });
      }

    }
  }
});

Also, the answer will be absent without the .name field.

Added new field{ _id: 4f34f343c7b0434217000012,
  original_link: 'http://com',
  publish_date: Fri, 10 Feb 2012 10:36:00 GMT,
  summary: 'some text',
  title: 'title exampel',
  comments: 
   [ { body: 'well',
       author: 4f30265e6f60dc061d000002,
       _id: 4f34f3b6f96c58541700000f,
       create_date: Fri, 10 Feb 2012 10:38:46 GMT } ],
  create_date: Fri, 10 Feb 2012 10:36:51 GMT }

// EDIT additional information

Well, I did not find the answer, but some, like console.log (feed.comments [index]) returns a link to the function. Maybe someone with more experience with Mongoose can explain what will be the workaround in this situation.

{ [Function] author: 'Some random field' }
+5
1

Mongoose, . :

feed = feed.toObject();

, .

+10

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