New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

models.application.js

import Model from "ember-data/model";
import attr from "ember-data/attr";
import { belongsTo, hasMany } from "ember-data/relationships";

Ember.computed.async = function (...args) {
	
  // Remove computed function to call later
  const func = args.pop();
  
  // Add new custom computed function that returns promise proxy
  args.push(function(propName) {

    // Call original computed function
    const promise = Ember.RSVP.resolve().then(() => func.call(this, propName));

    const ObjectPromiseProxy = Ember.ObjectProxy.extend(Ember.PromiseProxyMixin);

    return ObjectPromiseProxy.create({
      promise: promise,
    });
  });

  return Reflect.apply(Ember.computed, this, args);
};
Ember.computed.async.prorotype = Ember.computed.prototype;

export default Model.extend({
  name: attr('string'),
  
  promise: Ember.computed('name', () => {
    const name = this.get('name');
  	const promise = new Promise((resolve, reject) => {
      setTimeout(() => {
        resolve(name);
      }, 1000);
    });
    
    return promise;
  }),
  
  asyncComputed: Ember.computed.async('promise', () => {
    console.log(arguments);
    console.log(this);
  }),                                      
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    return this.get('store').createRecord('application', {
      name: "Alex",
    });
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
Name {{model.name}} <br>
{{input value=model.name}}

<br>
<br>
{{#if model.asyncComputed}}
Computed is true
{{else}}
Computed is false
{{/if}}

twiddle.json

{
  "version": "0.11.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.10.2",
    "ember-data": "2.11.0",
    "ember-template-compiler": "2.10.2",
    "ember-testing": "2.10.2"
  },
  "addons": {}
}