gistfile1.txt

// backs user model
define(['lazoSyncher'], function (LazoSyncher) { 
  
  return LazoSyncher.extend({
  
    authenticate: function (credentials, options) {
      // authenticate user using credentials
      // you can call options.success or options.error
      // update the user model, auth token, etc.
    }
  
  });
  
});

// in a controller that instantiated a user model
this.models.user.call('authenticate', {
  success: function () {
    // redirect user
  },
  error: function () {
    // render authentication error in the UI
  }
});