Ember Data Service Computed

controllers.application.js

import Ember from 'ember';

const {
  inject: { service },
} = Ember;

export default Ember.Controller.extend({
  product: service(),
});

controllers.products.js

import Ember from 'ember';

export default Ember.Controller.extend({

});

mirage.config.js

export default function() {
  this.get('products');
};

mirage.factories.product.js

import { Factory, faker } from 'ember-cli-mirage';

export default Factory.extend({
  price: 2,
});

mirage.models.product.js

import { Model } from 'ember-cli-mirage';

export default Model.extend({
});

mirage.scenarios.default.js

export default function(server) {
  server.create('product', { price: 1 });
  server.create('product', { price: 2 });
}

mirage.serializers.application.js

import { JSONAPISerializer } from 'ember-cli-mirage';

export default JSONAPISerializer.extend({
});

models.product.js

import Model from "ember-data/model";
import attr from "ember-data/attr";

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

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('products');
});

export default Router;

routes.index.js

import Ember from 'ember';

export default Ember.Route.extend({

});

routes.products.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
  	return this.store.findAll('product');  
  }
});

services.product.js

import Ember from 'ember';

const {
  computed,
  inject: { service },
} = Ember;

export default Ember.Service.extend({
  store: service(),
  products: computed(function() {
    return this.get('store').peekAll('product');
  }),
  totalPrice: computed('products.@each.price', function() {
    return this.get('products').reduce((acc, p) => {
      acc = acc + p.get('price');
      return acc;
    }, 0);
  }),
});

templates.application.hbs

<h1>Application</h1>
<p>Total Price: {{product.totalPrice}}</p>
{{outlet}}

templates.index.hbs

{{link-to 'Products' 'products'}}

templates.products.hbs

<h2>Products</h2>
<ul>
{{#each model as |product|}}
<li>{{product.price}}</li>
{{/each}}
</ul>

twiddle.json

{
  "version": "0.12.1",
  "ENV": {
  	"ember-cli-mirage": {
  		"enabled": true
    }
  },
  "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-cli-mirage": "0.3.1"
  }
}