Filter Mixin

gistfile1.js

export default Ember.Mixin.create({

	filteredItemCollection:function(types){
		
		var _this = this;

		return new Ember.RSVP.Promise(function(resolve, error){
			_this.store.find('item').then(function(collection){

				var filtered = collection.filter(function(item){
					return types.contains(item.get('typeTag'));
					
				});
				
				resolve(filtered);
			});
		});

	}

});