gistfile1.js

var deviceToSave = Device.build({});
Device.findOrCreate({
  where: {device_id: deviceToSave.device_id},
  defaults: deviceToSave.get()
}).spread(function(device, created) {
  if (created) return device;

  return device.updateAttributes(deviceToSave.get());
}).then(function (item) {
  response.code(201).send(item.get());
}).catch(function(error){
  return response.code(400);
});