Update or create helper for waterline on SailsJS

models.js

// Include this code on your config/models.js
updateOrCreate: function(criteria, values){
  var self = this;

  if (!values) values = criteria.where ? criteria.where : criteria;

  return this.findOne(criteria).then(function (result){
    if (result) {
      return self.update(criteria, values);
    } else {
      return self.create(values);
    }
  });
}