mongoose localized schema

mongoose_localized_schema.coffee

mongoose = require("mongoose")
Schema = mongoose.Schema

languages = ['de', 'en', 'es']
defaultLanguage = 'de'
getLanguage = () ->
	return 'de'

class MultilingualSchema extends Schema
	
	multilingualValues: []
	
	constructor: (obj, options) ->
		#console.log(obj, options)
		for key, value of obj
			# check if we have a multilingual property
			if 'i18n' of value and value['i18n'] is true
				delete value['i18n']
				@multilingualValues.push key
				
				struct = {}
				for lang in languages
					# make nested language struct
					struct[lang] = value
					
					# we only need to require one value per language - default language
					if (lang is defaultLanguage) is false and 'required' of value and value['required'] is true
						delete struct[lang]['required']

				# saving the new multilingual structures
				obj[key] = struct
		
		super(obj, options)
		
		for key in @multilingualValues
			# setting virtual methods for shorthand getters and setters
			v = "#{key}.i18n"
			@virtual(v).get () ->
				return @[key][getLanguage()]
			@virtual(v).set (value) ->
				return @[key][getLanguage()] = value

				

db = mongoose.createConnection("localhost", "test")

schema = new MultilingualSchema(
	name:
		i18n: true
		type: String
		trim: true
		required: true
)

Dummy = db.model("Dummy", schema)
d = new Dummy()
d.name.de = "sepp"
d.name.en = "joseph"
d.name.es = "jose"


d.save (err) ->
	if err
		return console.log(err)
		
	d.name.i18n = 'sepp_1'
	
	d.save (err) ->
		if err
			return console.log err
			
		console.log d.name.i18n
		console.log d.name.en
		console.log d.name.es

Hello @hetsch, I stumbled over this gist in google looking for ideas how to implement localized fields in mongoose. Have you eventually used this approach here?
If yes, how do you handling the getLanguage() in a real app when the user's locale is coming from the request?
thanks
Reto

here's an alternative approach that conforms better with mongoose way of building plugins - https://gist.github.com/viczam/3306456d3c63e2c21f1d

Same question as @RBLU has. and @viczam alternative solution doesn't solve this issue.