New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
	
  isValid: false,
  
  isValidObserver: Ember.observer('model.validations.isValid', function() {
    this.set('isValid', this.get('model.validations.isValid'));
  })
});

models.user.js

import Model from "ember-data/model";
import attr from "ember-data/attr";
import { belongsTo, hasMany } from "ember-data/relationships";
import { buildValidations, validator } from 'ember-cp-validations';

const Validations = buildValidations({
  name: validator('presence', true)
});

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

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
   return this.get('store').createRecord('user');
  }
});

templates.application.hbs

{{input value=(mut model.name) placeholder="Name"}}

<br>

isValid: {{model.validations.isValid}}
<br>
isValid Observer: {{isValid}}

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",
    "ember-cp-validations": "3.4.0"
  }
}