https://stackoverflow.com/questions/45047966/cannot-use-ember-power-select-in-each-block

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  Units: [{name:'Unit0',selected:''},{name:'Unit1',selected:''},{name:'Unit2',selected:''}], 
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<ul>
  {{#each Units as |unit|}}
    <li>
      <label>Select Unit</label>
      {{#power-select
        selected=unit.selected
        options=Units 
        onchange=(action (mut unit.selected)) 
        as |unit|
      }}
        {{unit.name}}
      {{/power-select}}
    </li>
  {{/each}}
</ul>
<br>
{{outlet}}
<br>
<br>
<div id="ember-basic-dropdown-wormhole"></div>

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-power-select": "1.8.0"
  }
}