virtual attributes with sequelize

virtual-attributes.js

var Sequelize = require('sequelize')
  , sequelize = new Sequelize('sequelize_test', 'root')

var User = sequelize.define('User', {
  username:      Sequelize.STRING,
  password_hash: Sequelize.STRING
}, {
  validate: {
    password: function(next) {
      if (((this._password || "").trim() !== '') && (this._password === this._password_confirmation)) {
        next()
      } else {
        next('Password not matching!')
      }
    }
  },

  getterMethods: {
    password: function() { return this._password },
    password_confirmation: function() { return this._password_confirmation }
  },

  setterMethods: {
    password: function(v) { this._password = v },
    password_confirmation: function(v) { this._password_confirmation = v }
  }
})

User.sync({ force: true }).success(function() {
  User
    .create({ username: 'foo', password: 'something', password_confirmation: 'different' })
    .complete(function(err, user) {
      console.log(err)

      User
        .create({ username: 'foo', password: 'something', password_confirmation: 'something' })
        .complete(function(err, user) {
          // should be empty
          console.log(err)
          console.log(user.values)
        })
    })
})