one-way-select

controllers.application.js

import Ember from 'ember';

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

models.book.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(),
  category: belongsTo('category')
});

models.category.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()
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    this.store.createRecord('category', { id: 1, name: 'First Category' });	
		this.store.createRecord('category', { id: 2, name: 'Second Category' });
    
    return this.store.createRecord('book', {
      id: 1,
      name: 'A Book',
      category: this.get('store').peekRecord('category', 2)
    });
  },
  setupController(controller, model) {
		this._super(...arguments);
   	controller.set('categories', this.store.peekAll('category'));
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
Record: {{model.name}}
<br>
Assigned category name: {{model.category.name}}
<br>
{{one-way-select model.category
    options=categories
    optionValuePath="id"
    optionLabelPath="name"
    includeBlank="please select a value"
  	promptIsSelectable=true
    update=(action (mut model.category))
}}
<br>
<br>

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