template syntax for related data - ember.js

Question

This seems like it should be simple. Suppose I have the following model:
App.Folder = DS.Model.extend({
folder_id: DS.attr('number'),
folder_name: DS.attr('string'),
items: DS.hasMany('App.Item')
});
App.Item = DS.Model.extend({
item_id: DS.attr('number'),
folder_id: DS.attr('number'),
item_name: DS.attr('string'),
folder: DS.belongsTo('App.Folder')
});
...and the following data:
App.Folder.FIXTURES = [
{
id: 1,
folder_name: 'My First Folder',
items: [100]
},
{
id: 2,
folder_name: 'Another Folder',
items: [101]
},
{
id: 3,
folder_name: 'Folder 3',
items: [102]
}
];
App.Item.FIXTURES = [
{
id: 100,
folder_id: 1,
item_name: 'This is an item'
},
{
id: 101,
folder_id: 2,
item_name: 'A cleverly named item'
},
{
id: 102,
folder_id: 3,
item_name: 'This one is also an item in a folder'
}
];
Now, in my "item" template, shouldn't I be able to do something like this to show the folder related to an item:
<script type="text/x-handlebars" data-template-name="snapshot">
<div class="row-fluid property-row-alt">
<div class="span4 property-label">item name:</div>
<div class="span8">{{ item_name }}</div>
</div>
<div class="row-fluid property-row">
<div class="span4 property-label">folder:</div>
<div class="span8">{{ folder.folder_name }}</div>
</div>
</script>
"folder.folder_name" is the key syntax I'm trying to nail down here. Maybe this isn't possible, but I'm hoping to get the related folder and drill down into it's folder_name inside my item template. Can I do this in Ember? Using the latest versions.