Script to demonstrate an issue in Sequelize. https://github.com/sequelize/sequelize/issues/481

sequelize.js

var Sequelize = require('sequelize');

// Set up database connection
var sql = new Sequelize('database', 'root', '', {
  dialect: 'mysql'
});

// Global counter
var counter = 0;

// Define simple model
var Job = sql.define('Job', {
  counter: { type: Sequelize.INTEGER }
});

// Sync model to database and start counter process
Job.sync().success(function() {
  Job.create({ counter: counter}).success(function (job) {
    updateCounter(job);
  });
});

// Update a job with an incremented counter, loops infinitely.
function updateCounter(job) {
  counter++;
  console.log("Run " + counter);
  job.counter = counter;
  job.save().success(function () {
    // save completed!
    console.log('Save completed ' + counter);
    updateCounter(job);
  }).error(function (err) {
    // something bad :(
    console.log('Save failed ' + counter);
    updateCounter(job);
  });
}