Angular - Rich Data Model Pattern

dataModel.js

angular.module('app').run(function($q, $timeout){
  
  function User(data){
    if(this == window)return new User(data);
    
    angular.extend(this, data);
  }
  
  User.prototype.sayHi = function(){
    console.log("HI!!!");
  };
  
  angular.module('app').constant('User', User);
});