Input id not updating

components.checkbox-component.js

import Ember from 'ember';

const { computed, get, set } = Ember;

export default Ember.Component.extend({
  inputId: computed('index', 'todo.{course,completed}', {
    get() {
      return `${get(this, 'todo.course')}__${get(this, 'index')}`;
    }
  }),
  
  actions: {
    completeTodo() {
      set(this, 'todo.complete', true);
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  todos: [
    {
    	description: 'abc',
      complete: false
  	}, {
  		description: '123',
    	complete: false
    }
  ],
  completeTodos: Ember.computed.filterBy('todos', 'complete', true),
  incompleteTodos: Ember.computed.filterBy('todos', 'complete', false)
});

controllers.index.js

import Ember from 'ember';

const { computed: { filterBy } } = Ember;

export default Ember.Controller.extend({
  todos: [
    {
    	description: 'abc',
      course: 'English',
      complete: false
  	}, {
  		description: '123',
    	course: 'English',
    	complete: false
    }
  ],
  completeTodos: filterBy('todos', 'complete', true),
  incompleteTodos: filterBy('todos', 'complete', false)
});

routes.index.js

import Ember from 'ember';

export default Ember.Route.extend({
});

templates.application.hbs

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

templates.components.checkbox-component.hbs

{{input 
  type="checkbox"
  id=inputId
  change=(action "completeTodo")
}}
<label for="{{inputId}}">
  Our id is {{inputId}}
 </label>

templates.index.hbs

{{#each incompleteTodos as |todo index|}}
  {{checkbox-component todo=todo index=index}}
{{/each}}

twiddle.json

{
  "version": "0.10.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.8.0",
    "ember-data": "2.8.0",
    "ember-template-compiler": "2.8.0",
    "ember-testing": "2.8.0"
  },
  "addons": {}
}