node.js - Querying after populate in Mongoose -

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i'm pretty new mongoose , mongodb in general i'm having difficult time figuring out if possible: 

item = new schema({     id: schema.objectid,     datecreated: { type: date, default: date.now },     title: { type: string, default: 'no title' },     description: { type: string, default: 'no description' },     tags: [ { type: schema.objectid, ref: 'itemtag' }] });  itemtag = new schema({     id: schema.objectid,     tagid: { type: schema.objectid, ref: 'tag' },     tagname: { type: string } });    var query = models.item.find({});  query     .desc('datecreated')     .populate('tags')     .where('tags.tagname').in(['funny', 'politics'])     .run(function(err, docs){        // docs empty     });

is there better way this?

edit

apologies confusion. i'm trying items contain either funny tag or politics tag.

edit

document without clause:

[{      _id: 4fe90264e5caa33f04000012,     dislikes: 0,     likes: 0,     source: '/uploads/loldog.jpg',     comments: [],     tags: [{         itemid: 4fe90264e5caa33f04000012,         tagname: 'movies',         tagid: 4fe64219007e20e644000007,         _id: 4fe90270e5caa33f04000015,         datecreated: tue, 26 jun 2012 00:29:36 gmt,         rating: 0,         dislikes: 0,         likes: 0      },     {          itemid: 4fe90264e5caa33f04000012,         tagname: 'funny',         tagid: 4fe64219007e20e644000002,         _id: 4fe90270e5caa33f04000017,         datecreated: tue, 26 jun 2012 00:29:36 gmt,         rating: 0,         dislikes: 0,         likes: 0      }],     viewcount: 0,     rating: 0,     type: 'image',     description: null,     title: 'dogggg',     datecreated: tue, 26 jun 2012 00:29:24 gmt   }, ... ]

with clause, empty array.

what asking isn't directly supported can achieved adding filter step after query returns.

first, .populate( 'tags', null, { tagname: { $in: ['funny', 'politics'] } } ) need filter tags documents. then, after query returns you'll need manually filter out documents don't have tags docs matched populate criteria. like:

query.... .exec(function(err, docs){    docs = docs.filter(function(doc){      return doc.tags.length;    })    // stuff docs });

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