I have a template rendering my Collection using `{{#each Collection}}`, I'm using iron-router to route this template like this: 

```
Router.route('/home', function () {
this.render('home');
this.layout('header');
});

```

how can i use a "books" filter button so iron-router apply that filter to the subscription so i can only see the filtered version of my Collection like the following:

```
Collection.find({category: "books"});

```