New Twiddle

controllers.application.js

import Ember from 'ember';

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

models.currency.js

import Model from "ember-data/model";
import attr from "ember-data/attr";
import { belongsTo, hasMany } from "ember-data/relationships";

export default Model.extend({
  name: attr("string")
});

models.product.js

import Model from "ember-data/model";
import attr from "ember-data/attr";
import { belongsTo, hasMany } from "ember-data/relationships";

export default Model.extend({
  name: attr("name"),
  currency: belongsTo(),
  currency2: attr()
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
   this.store.createRecord('currency', { id: 1, name: "USD" });
   this.store.createRecord('currency', { id: 2, name: "EUR" });
   this.store.createRecord('currency', { id: 3, name: "YEN" });
    
   return this.store.createRecord('product'); 
  },
  setupController(controller, model) {
   controller.set('model', model);
   controller.set('currencies', this.store.peekAll('currency'));
  }
});

templates.application.hbs

<h2>Expected behaviour</h2>

Selected Currency:
{{model.currency2.name}}
<br>
Currencies Dropdown
{{one-way-select 
	model.currency2 
  options=currencies
  optionLabelPath="name"
  includeBlank=true
	update=(action (mut model.currency2))  
}}

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": {
  	"ember-one-way-controls": "2.0.0"
  }
}