getWithDefault-on-model

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  foo: Ember.computed('model', function () {
    return this.getWithDefault('model', 'model is undefined');
  }),
  
  bar: Ember.computed('barProperty', function () {
    return this.getWithDefault('barProperty', 'barProperty is undefined');    
  })
});

models.my-model.js

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

export default Model.extend({
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
model is: {{foo}}
<br>
barProperty is: {{bar}}
<br>

twiddle.json

{
  "version": "0.10.4",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.7.0",
    "ember-data": "2.7.0",
    "ember-template-compiler": "2.7.0"
  },
  "addons": {}
}