relationship not working

gistfile1.js

App.Show = DS.Model.extend({
	title: DS.attr('string'),
	airing: DS.hasMany('App.Airing')
});

App.Airing = DS.Model.extend({
	channel: DS.attr('number'),
	show: DS.belongsTo('App.Show')
});

<script type="text/handlebars">
{{#each airing in controller}}
  <tr>
    <td>{{airing.show.id}}</td>
    <td>{{airing.show.title}}</td>
  </tr>
{{/each}}
</script>