test destroying

controllers.application.js

import Ember from 'ember';

let Prvek = Ember.Object.extend({
  title: "I am prverk",
  init(){
    let pole = this.constructor.pole;
    this.set('id',pole.length > 0 ? pole[pole.length-1].id + 1 : 0);
    this.constructor.pole.pushObject(this);
  },
  willDestroy(){
    //this.constructor.runDeleteCallback(this);
    // console.log(`Destroing element with id ${this.get('id')}`);
    let pole = this.constructor.pole;
    let index = pole.indexOf(this);
    pole.splice(index,1);
  }
});
// statická metoda jednotná pro celou třidu a všechny instance
Prvek.reopenClass({
  pole: []
});

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  pole: Prvek.pole,
  init(){
    this._super(...arguments);
    Prvek.create();
    Prvek.create();
    Prvek.create();
    /*
      Prvek.deleteCallback((item)=>{
        let pole = this.get('pole');
        let index = pole.indexOf(item);
        pole.splice(index,1);
        this.notifyPropertyChange('pole');
      });
      */
  },
  actions: {
    delete(item){
      item.destroy();
      this.notifyPropertyChange('pole');
      // console.log('Pole prvku:', this.get('pole'));
    },
    add(){
        Prvek.create();
  	}
  }
  
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>
<p>
	Velikost pole: {{pole.length}}
	<button {{action "add"}}>Increase</button>
</p>
<ul>
  {{#each pole as |prvek|}}
  	{{#unless prvek.isDestroying}}
      <li>Hello, {{prvek.id}}!<button {{action "delete" prvek}}>Delete</button> isDestroyed:{{prvek.isDestroyed}}</li>
    {{/unless}}
  {{/each}}
</ul>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}