Convert Mongoose obj to JS obj and all ObjectIds to String

gistfile1.coffee

toObject = (item) ->
	
	return item unless item.toObject

	json = item.toObject()

	for key, val of json
		if _.isArray val
			json[key] = _.map val, (element) -> toObject element
		else
			if val.toHexString then json[key] = val.toHexString()
	return json


jsonify = (item) ->
	return item unless item
	if _.isArray item
		_.map item, (element) -> toObject element
	else
		toObject(item)

This sample use toHexString to detect if an object is a ObjectID.