checked event on input

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  boxes:[{id:1},{id:2},{id:3}],
  boxArr: Ember.computed('boxes.@each.value', {
    get() {
      let disableOthers = Ember.get(this, 'boxes').filterBy('value', true).get('length') >= 2;
      return Ember.get(this, 'boxes').map(({id, value}) => {
        return {
          id,
          value,
          disabled: disableOthers && !value,
        };
      });
    }
  }),
  actions: {
    disableCheckbox(id, event) {
      Ember.set(Ember.get(this, 'boxes').findBy('id', id), 'value', event.target.checked);
    }
  }
});

templates.application.hbs

<h1>boxes</h1>
<ul>
{{#each boxes as |box|}}
	<li>{{box.id}}: {{box.value}}</li>
{{/each}}
</ul>

<h1>check</h1>
<ul>
{{#each boxArr as |box|}}
	<li>
  {{ input type="checkbox" disabled=box.disabled checked=box.value change=(action "disableCheckbox" box.id)}} {{checkbox.id}}
  </li>
{{/each}}
</ul>

twiddle.json

{
  "version": "0.7.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember-template-compiler.js"
  }
}