Computed properties

application.controller.js

import Ember from 'ember';
import Account from '../models/account';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  name: "",
  balance: 0,

  totalBalanceInCents: function() {
    return this.model.reduce(function(previousValue, account) {
      return previousValue + account.get('balanceInCents');
    }, 0);
  }.property('model.@each.balanceInCents'),

  totalBalance: function() {
    return this.get('totalBalanceInCents') / 100;
  }.property('totalBalanceInCents'),

  actions: {
  	createAccount() {
      this.store.createRecord('account', {
        name: this.get('name'),
        balance: this.get('balance')
      });
    }
	}
});

application.route.js

import Ember from 'ember';

export default Ember.Route.extend({
	init: function() {
    this.store.push({
      data: [{
        id: 1,
        type: 'account',
        attributes: {
          name: 'Test account',
          balanceInCents: 1000
        },
        relationships: {}
      }, {
        id: 2,
        type: 'account',
        attributes: {
          name: 'Test account 2',
          balanceInCents: 5000
        },
        relationships: {}
      }]
    });
  },
  model: function() {
    return this.store.peekAll('account');
  }
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<table>
  <tr>
    <th>Name</th>
    <th>Balance</th>
  </tr>
  {{#each model as |account|}}
    <tr>
      <td>{{account.name}}</td>
      <td>{{account.balance}}</td>
    </tr>
  {{/each}}
  <tr>
    <th>Total</th>
    <th>{{totalBalance}}</th>
  </tr>
</table>
<br>
<br>
<form id="new_account" {{action "createAccount" on="submit"}}>
  <label for="name">Name</label>
  {{input value=name placeholder="Name"}}

  <label for="name">Balance</label>
  {{input value=balance placeholder="0"}}

	<input type="submit" value="Create Account" />
</form>
{{outlet}}
<br>

models.account.js

import DS from 'ember-data';

export default DS.Model.extend({
  name: DS.attr('string'),
  balanceInCents: DS.attr('number', { defaultValue: 0 }),
 
  balance: Ember.computed('balanceInCents', {
    get(key) {
      var cents = this.get('balanceInCents');
      Ember.debug("Cents: " + cents);
      var dollars = cents / 100;
      Ember.debug("Dollars: " + dollars);
      return this.get('balanceInCents') / 100;
    },
    set(key, value) {
      var cents = value * 100;
      Ember.debug("Setting balance, cents: " + cents);
      this.set('balanceInCents', cents);
      return value;
    }
  }),
 
  balanceInCentsChanged: Ember.observer('balanceInCents', function() {
    console.log("balanceInCents changed to: " + this.get('balanceInCents'));
  })
});

twiddle.json

{
  "version": "0.4.16",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.1.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember-template-compiler.js"
  }
}