Searching embedded documents in MongoDB (mongoose)

config.js

'use strict';

module.exports = function (mongoose) {
    mongoose = mongoose || require('mongoose');
    var note = {
        type: String
      , required: true
    };
    var created = {
        type: Date
      , default: Date.now
    };
    var CommentSchema = new mongoose.Schema({
        note: note
      , created: created
    });
    var NoteSchema = new mongoose.Schema({
        body: note
      , created: created
      , comments: [CommentSchema]
    });

    var config = {};
    config.Note = mongoose.model('Note', NoteSchema);
    config.mongo = {
        server : 'mongodb://localhost:27017'
      , db     : 'zeroDev'
      , mongodb: function () {
            return [ this.server, this.db ].join('/');
        }
    };

    return config;
};

searchEmbbedNote.js

'use strict';

var mongoose = require('mongoose');
var config   = require('./config')( mongoose );
var mongo = config.mongo;
var Note  = config.Note;

var app = {};
app.error = function (err) {
    console.error(err);
    return this;
};
app.resResult = function (note, i) {
    console.log('%d - %s', i, note.body.split(/\n/)[0]);
    return this;
};
app.search = function (cond) {
    var that = this;
    Note.find(cond, function (err, notes) {
        console.log('cond: "%s"', JSON.stringify(Object.keys(cond)));
        if (err) return that.error(err);
        if (notes.length === 0)
            return that.error('cond: "%s" not found', JSON.stringify(cond));

        notes.forEach(that.resResult.bind(that));
        console.log("------------------------------------------\n");
    });
    return this;
};


mongoose.connect( mongo.mongodb() );
console.log('[mongoose] MongoDB connected on "%s"', mongo.mongodb());

app.search({body: /jquery/i })
   .search({'comments.note': /./ })
   .search({body: /p[^\s]+/i, 'comments.note': /./ });