Move duplicated routes code in emberjs

I have to very similar routes:

App.DiscountRoute = Ember.Route.extend({
    model: function() {
        return Ember.RSVP.hash({
            categories: this.store.findAll('discountCategory'),
            discounts: this.store.findAll('discount'),
            total_size: 6
        });
    }
});

and

App.CategoryRoute = Ember.Route.extend({
    renderTemplate: function() {
        this.render('discount');
    },
    model: function(params) {
        return Ember.RSVP.hash({
            categories: this.store.findAll('discountCategory'),
            discounts: this.store.filter('discount',function(discount) {
                return discount.get('discountCategory').get('id')==params.category_id
            }),
            total_size: 6
        });
    }
});

Where should I place categories model and total_size counter, which will be available from any routes in my application?