'Trying to open unclosed connection' error' using Mongoose and embedded documents - connection

Question

I'm getting a connection related error when defining a static query that filters an embedded document field.
I've tried to separate the embedded document in a separate schema file but didn't resolve the issue. Any ideas?
Error follows:
C:\development_GIT\myproject\app\models\mymodel.js:40
this.find({ text.lang_code: langCode }).sort('text.name').exec(callback);
^
Error: Trying to open unclosed connection.
at NativeConnection.Connection.open (C:\development_GIT\myproject\node_
modules\mongoose\lib\connection.js:205:15)
at Mongoose.connect (C:\development_GIT\myproject\node_modules\mongoose
\lib\index.js:156:15)
at Object.<anonymous> (C:\development_GIT\myproject\server.js:13:10)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at repl:1:1
The error is launched when using the filter { text.lang_code: langCode }
option in the following model. If I don't use the embedded document and try to filter for exampe { _id: langCode } it does not throw errors.
//MyModel.js located at ./app/models
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var MyModelSchema = new Schema({
name: { type: String, trim: true },
text: [{ name: String, lang_code: String }]
});
MyModelSchema .static({
findByLangCode : function(langCode, callback) {
this.find({ text.lang_code: langCode }).sort('text.name').exec(callback);
}
});
mongoose.model('MyModel', CategorySchema);
The first lines of my main file server.js are:
//server.js
var express = require('express');
var env = process.env.NODE_ENV || 'development';
var config = require('./config/config')[env];
var mongoose = require('mongoose');
var fs = require('fs');
require('express-namespace');
mongoose.connect(config.db);
// Bootstrap models
fs.readdirSync(__dirname + '/app/models').forEach(function (file) {
if (~file.indexOf('.js')) require(__dirname + '/app/models/' + file)
});

Answer 1

Solution was building the query in a different way. It seems that subdocuments can not be used inside find().
Before: (not working)
this.find({ text.lang_code: langCode }).sort('text.name').exec(callback);
After (working)
this.find().where('text.lang_code').equals(langCode).sort('text.name').exec(callback);

Answer 2

Im using this all the time and it works fine for me.
this.find({ 'text.lang_code': langCode }).sort('text.name').exec(callback);
MongoDb can only handle one lvl of objects, but if you give it a string like you are doing in the .where function, mongodb will do magic and match it to subdocuments :)