Where to put sortBy('name') in the controller?

The following controller doesn't result in any ships. If I delete

model = model.sortBy('name');

it results in all ships but obviously they are not sorted by the name attribute.

How can I fix this?

app/controllers/index.js

import Ember from 'ember';

export default Ember.Controller.extend({
  selectedCompany: null,

  companies: function(){
    var model = this.get('model.companies');
    return model;
  }.property('model.companies'),

  ships: function(){
    var model = this.get('model.ships');
    model = model.sortBy('name');
    return model;
  }.property('model.ships')
});