Store Example

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  orders: null,
  
  init() {
  	this.set('orders', this.get('store').findAll('order'));
  }
});

application.template.hbs

<h1>{{appName}}</h1>
<br>
<br>
{{#each orders as |order|}}
{{else}}
No order.
{{/each}}
<br>
<br>

models.order-item.js

import DS from 'ember-data';
import Ember from 'ember';

export default DS.Model.extend({
  product_type: DS.belongsTo('product'),
  order: DS.belongsTo('order'),
  quantity: DS.attr('number', { defaultValue: 0 }),
  item_price: Ember.computed('product_type.price', 'quantity', function() {
    const p = this.get('product_type').get('price');
    const q = this.get('quantity');
    return p * q;
  }),
});

models.order.js

import DS from 'ember-data';
import Ember from 'ember';

export default DS.Model.extend({
  products: DS.hasMany('order-item'),
  total_price: Ember.computed('products.@each.item_price', function() {
    let s = 0.0;
    this.get('products').forEach(p => { s += p.get('item_price') });
    return s;
  }),
});

models.product.js

import DS from 'ember-data';

export default DS.Model.extend({
  price: DS.attr('number'),
});

twiddle.json

{
  "version": "0.6.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "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/2.3.1/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.3.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}