Ember direct URL or page refresh empty model

Asked By: Anonymous

I have an index page with different courses. From that index page you can navigate to a specific course by a link-to. When I navigate to a course everything works fine but when I refresh the page or go to that URL directly the model is empty.

This is how my code looks like:

index.hbs ---------------------------------------
<div class="row">
<div class="col-md-6 col-md-offset-3 text-center">
    <h1>Become a Tjuna Fish</h1>
    <img src="http://placehold.it/500x300">
    <p>Leer met de technieken werken die bij Tjuna worden gebruikt en ontwikkel    jezelf tot een echte Tjuna Fish!</p>
   </div>
  </div>

  <div class="row">
    <h1 class="text-center">Cursussen</h1>
    {{#each}}
        <div class="col-md-4 text-center">
        <div class="row">
            <img {{bind-attr src="img"}}/>
        </div>
        <div class="row">
          {{#link-to "course" this}}{{title}}{{/link-to}}
        </div>
    </div>
    {{/each}}
    </div>

scripts ---------------------------------------
BecomeTjunaFish.Router.map(function () {
// Add your routes here
 this.resource('index', {path: '/'});
 this.resource('course', { path: ':url'});

});

BecomeTjunaFish.IndexRoute = Ember.Route.extend({
 // admittedly, this should be in IndexRoute and not in the
 // top level ApplicationRoute; we're in transition... :-)
 model: function () {
    return this.store.find('course');
 }

});

BecomeTjunaFish.CourseRoute = Ember.Route.extend({
 // admittedly, this should be in IndexRoute and not in the
 // top level ApplicationRoute; we're in transition... :-)
 model: function (params) {
    return this.store.find('course', params.id);
 }

});

BecomeTjunaFish.Course = DS.Model.extend({
 title: DS.attr('string'),
 img: DS.attr('string'),
 goal: DS.attr('string'),
 targetGroup: DS.attr('string'),
 prerequisites: DS.attr('string'),
 url: DS.attr('string')
});

BecomeTjunaFish.Course.FIXTURES = [
 {
  id: 1,
  title: 'Tjuna Basis',
  img: 'http://placehold.it/200x200',
  goal: 'kunnen werken met de basis tools en opmaaktalen die Tjuna gebruikt',
  targetGroup: 'frontend developers in wording',
  prerequisites: 'geen',
  url: 'basis_cursus'
 },
 {
  id: 2,
  title: 'Tjuna Frontend',
  img: 'http://placehold.it/200x200',
  goal: '',
  targetGroup: '',
  prerequisites: '',
  url: 'frontend_cursus'
 },
 {
  id: 3,
  title: 'Tjuna Backend',
  img: 'http://placehold.it/200x200',
  goal: '',
  targetGroup: '',
  prerequisites: '',
  url: 'backend_cursus'
 }
];

Solution

Answered By: Anonymous

You need to specify the dynamic segment as :id in your router. What happens is,

1. When you transition via {{link-to}}, you pass the entire model object. Hence while retrieving the course model(this.store.find('course', params.id);) in route#model , you have the id with you and thereby fetching the model with no trouble.

2. When you hit back or refresh the course page, all you have is the course url in the address bar URL. This course url (note the entire course object) will be passed to the course route#model hook where you try to retrieve using the id. Hence it blows up

So make your dynamic segment as id in the router to make it work. You can also fetch the records with name.

Working Jsbin