angularjs design pattern and best practice to get data from server

what im trying to achive is have an Model function that contain all the object behaviour, and a factory singelton that creates, save, update, and keep collections of such models, so that i can use them inside angular controllers.

For example i will use Users Model

Attempt1

Model:

window.interfaces = window.interfaces||{};
window.interfaces.Person = function(data){
  var self = this;
  data = data || {};

  //TypeCasting For properties
  this.id = parseInt(data.id);
  this.saved = !!(this.id);
  this.deleted = !!(data.time_deleted > 0);
  this.fullname = String(data.user+'');
  data = undefined;//clear data variable. we dont need it anymore

  ///Methods
  this.first_name = function(){
    return self.fullname.substring(0,self.fullname.indexOf(' '));
  };
  this.last_name = function(){
    return self.fullname.substring(self.fullname.lastIndexOf(' '));
  }
  this.change = function(v){
    self.fullname = (self.fullname==='hello world')?'Was hello':v;
  }
}

Factory:

myApp.service('People', function () {
  var container = [];
  var self = this;

  this.all = function(){
    console.log('called all',container);
    return container;
  }

  this.createMany = function(data){
    data.forEach(function(el){
     container.push(new window.interfaces.Person(el));
    });
    return container;
  }

  this.createOne = function(obj){
   var index = container.push(new window.interfaces.Person(obj));
   return container[index-1];
  }

});

First question: does angular provide a way to create Models to be injected in services so that i dont have to save them in window.interfaces* ?

now in my controller i can have something like

myApp.controller('ctrl1',function(People,$scope){
 $scope.people = people.all();
});

myApp.controller('ctrl2',function(People,$scope){
 $scope.people = people.all();
});

<div ng-controller="ctrl1">
  <label ng-repeat="person in people">{{person.first_name()}}</label>
  <button ng-click="person.change('new name')"></button>
</div>
<div ng-controller="ctrl2">
  <label ng-repeat="person in people">{{person.first_name()}}</label>
</div>

using such approach i can contain behaviour of my objects in their own models,yet performance wise, how bad is this approach ? does angular watchers will easily track this or it will trigger un-needed digest cycles ?

Fiddle for example http://ift.tt/1qfFoFN