gistfile1.js

//This is in the appliation route:

setupController:function(controller, model) {
  	this._super(controller, model);
  	this.filterable(['ingredient', 'recipe']).then(function(array) {
  	  controller.set('itemCollection', array)
  	});
	
},

//This doesn't work
filterable:function(types){
	return this.store.find('item').then(function(collection){
		return collection.filter(function(item){
			return types.contains(item.get('typeTag'));
		});
	});
}

//This works but is not filtered properly
filterable:function(types){
	return this.store.find('item').
}

...

//This is in the controller
items:function(){
	return this.get('itemCollection');
}.property('itemCollection.@each'),

...
//In the template. Not valid with the filtering cause items is a promise
{{#each items}}
	{{this}}
{{/each}}