SequelizeJS many to many - part 2

gistfile1.js

/**
 * create database spike;
 * grant all privileges on spike.* to 'anon'@'localhost' identified by 'password';
 * flush privileges;
 */

var async = require('async');

// set up sequelize
var Sequelize = require("sequelize");
var sequelize = new Sequelize('spike', 'anon', 'password', {
  logging: console.log
});

var User = sequelize.define('User', {
  name: Sequelize.STRING
});


// set up our models
var Project = sequelize.define('Project', {
  name: Sequelize.STRING,
  status: Sequelize.TEXT
});

Project.hasMany(User, { as: 'User', as: 'contributors' });
User.hasMany(Project, { as: 'contributors' });


async.waterfall([
  // create tables
  function (next) {
    return sequelize.sync({force: true}).then(function () {
      next();
    });
  },
  // insert users
  function (next) {
    return User.create({name: 'u1'}).then(function (u1) {
      User.create({name: 'u2'}).then(function (u2) {
        User.create({name: 'u3'}).then(function (u3) {
          next(null, u1, u2, u3);
        });
      });
    });
  },
  // insert projects
  function (u1, u2, u3, next) {
    return Project.create({name: 'p1'}).then(function (p1) {
      Project.create({name: 'p2'}).then(function (p2) {
        Project.create({name: 'p3'}).then(function (p3) {
          next(null, u1, u2, u3, p1, p2, p3);
        });
      });
    });
  },
  // associate users and projects
  function (u1, u2, u3, p1, p2, p3, next) {
    return u1.setContributors([p1, p2, p3]).then(function () {
      u2.setContributors([p1, p3]).then(function () {
        u3.addContributor(p2).then(function () {
          next(null, u1, u2, u3, p1, p2, p3);
        });
      });
    });
  },
  // run some queries
  function (u1, u2, u3, p1, p2, p3, next) {
    u1.getContributors({where: {name: 'p1'}}).then(function (projects) {
      console.log('User 1 has ' + projects.length + ' projects named p1');
    });
    p2.getContributors({where: {name: 'u1'}}).then(function (users) {
      console.log('Project 2 has ' + users.length + ' user named u1');
    });
    p2.getContributors({where: {name: { like: 'u%'}}}).then(function (users) {
      console.log('Project 2 has ' + users.length + ' users named like u%');
    });
  }
]);