Powerselect

controllers.application.js

import Ember from 'ember';
import { getNames } from 'ember-i18n-iso-countries';

export default Ember.Controller.extend({
  
  countries: getNames("en"),
  selected : "CZ",
  
  options: Ember.computed('countries', function() {
    return Object.keys(this.get("countries"));
  }),
  
  actions: {
    selected(value) {
      console.log("selected", value);
      // Here we take model, given field and set the value.
    }
  }
});

templates.application.hbs

  {{#power-select 
    options=options 
    selected=selected
    searchEnabled=true 
    allowClear=allowClear
    onchange=(action "selected") as |option|}}
      {{get countries option}}
  {{/power-select}}

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": "1.10.4",
    "ember-i18n-iso-countries": "1.2.0" 
  }
}