Two level model for formage

recipes.js

var mongoose = require('mongoose'),
    Types = mongoose.Schema.Types;

var Level2 = {
    name : { type: String }
};

var Level1 = {
    name : { type: String },
    items : [ Level2 ]
};

var schema = new mongoose.Schema({
    title: { type: String },
    items : [ Level1 ]
});

schema.methods.toString = function() {
    return this.title;
};

var pages = module.exports = mongoose.model('recipes', schema);