New Twiddle

application.controller.js

import Ember from 'ember';

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

application.route.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    return this.store.createRecord('widget', {name: "Example Model Name"});
  },
  
  actions: {
   	makeError() {
      console.log('adding an error');
      this.get('currentModel.errors').add('name', 'this is broken');
    },
    
    clearError() {
      console.log('clearing an error');
      this.get('currentModel.errors').remove('name');
    }
  }
});

application.template.hbs

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

<div>
  {{model.name}}
</div>
<br>

<button {{action "makeError"}}>Make Error</button> | 
<button {{action "clearError"}}>Clear Error</button>
<br>

<div>
  {{#each model.errors as |error|}}
    {{error.message}}
  {{/each}}
</div>

models.widget.js

import DS from 'ember-data';

export default DS.Model.extend({
  name: DS.attr('string')
});

twiddle.json

{
  "version": "0.4.11",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.9/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.11/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.9/ember-template-compiler.js"
  }
}