old_contents: define([
    'chaplin',
    'models/base/model'
  ], function(Chaplin, Model) {
    'use strict';
  
    var HelloWorld = Model.extend({
  
      defaults: {
        message: 'Hello World!'
      }
  
      //,initialize: function(attributes, options) {
        //Model.apply(this, arguments);
        //console.debug('HelloWorld#initialize');
      //}
  
    });
  
    return HelloWorld;
  });
  
new_contents: define([
    'chaplin',
    'models/base/model'
  ], function(Chaplin, Model) {
    'use strict';
  
    var HelloWorld = Model.extend({
  
      defaults: {
        message: 'Hello World!'
      }
  
      //,initialize: function(attributes, options) {
      //  Model.prototype.initialize.apply(this, arguments);
      //  console.debug('HelloWorld#initialize');
      //}
  
    });
  
    return HelloWorld;
  });
  
subject: Update hello_world.js