New Twiddle

application.route.js

import Ember from 'ember';

export default Ember.Route.extend({
  beforeModel() {
   let todos =  [
      {name: 'one', completed: false},
      {name: 'two', completed: false},
      {name: 'three', completed: true}
    ];
    todos.forEach( attrs => this.store.createRecord('todo', attrs));
  },
  
  model() {
   return this.store.peekAll('todo'); 
  }
});

controllers.application.js

import Ember from 'ember';

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

models.todo.js

import Model from "ember-data/model";
import attr from "ember-data/attr";

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

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
});

export default Router;

templates.application.hbs

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


{{todo-list todos=model}}

todo-item.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  tagName: 'li',
  click() {
    this.item.set('completed', true);
  }
});

todo-item.template.hbs

{{#if item.completed}}
  <span style="font-weight: 900; color: green; text-decoration: line-through;">
    {{item.name}}
  </span>
{{else}}
  {{item.name}}
{{/if}}

todo-list.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  store: Ember.inject.service(),
  
  sortBy: ['completed:asc', 'name:asc'],
  sortedTodos: Ember.computed.sort('todos', 'sortBy'),
  
  actions: {
    addTodo() {
     this.get('store').createRecord('todo', {
          name: this.get('newTodoText'),
          completed: false});
      
     this.set('newTodoText', ''); 
    }
  }
});

todo-list.template.hbs

{{input value=newTodoText enter="addTodo" }}
<button {{action 'addTodo'}}>Add</button>

{{#each sortedTodos as |todo|}}
	{{todo-item item=todo}}
{{/each}}

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": true,
    "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"
  }
}