Something

controllers.application.js

import Ember from 'ember';

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

models.test-model.js

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

const { computed } = Ember;

export default Model.extend({
  
  
  name: 		DS.attr("string"),
  
  
  
  something: computed("name", function() {
    
    let name = this.get("name");
    this.set("displayName", `Captain ${name}`);
    
  }),
  
  
  greeting: computed("displayName", function() {
    
    let displayName = this.get("displayName");
    
    return `Hello, ${displayName}`;
    
  })
  
  
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({

	model() {
   return this.store.createRecord("test-model", { name: "pugwash" }); 
  }


});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}


{{model.name}}

{{model.greeting}}
<br>
<br>

twiddle.json

{
  "version": "0.8.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.5.1",
    "ember-data": "2.5.2",
    "ember-template-compiler": "2.5.1"
  }
}