text: var mongoose = require('mongoose');
  var Schema = mongoose.Schema;
  var User = require('./users.js');
  // var Notes = require('./notes.js');
  
  // set up a mongoose model and pass it using module.exports
  /*module.exports = mongoose.model('NoteBooks', new Schema({
  	title: String,
  	notes: [Notes],
  	autor: [User]
  }));*/
  module.exports = mongoose.model('NoteBooks', new Schema({
  	title: String,
  	// notes: [Notes],
  	notes: [Schema.ObjectId],
  	autor: Schema.ObjectId
  }));
  