Load hasMany products of a given category

How can I load only the products of a given category in the route.js? My current route.js loads the first category but all products. But I only want the products of the first category.

app/category/model.js

import DS from 'ember-data';

export default DS.Model.extend({
  name: DS.attr('string'),
  products: DS.hasMany('product', { async: true })
});

route.js

import Ember from 'ember';

export default Ember.Route.extend({
  model: function() {
    return {
      category: this.store.find('category', 1),
      products: this.store.find('product')
    };
  }
});