index.js

// app/routes/category/index.js

import Ember from 'ember';
import Protected from '../protected';

export default Protected.extend({
	model: function (params) {
		var url = this.store.adapterFor('application').getBaseUrl() + '/categories/'+ params.category + '/assets';

		this.controllerFor('categories').set('activeCategory', params.category);

		return Ember.$.getJSON(url).then(function (data) {
			return data.assets;
		});
	}
});

router.js

import Ember from 'ember';
import config from './config/environment';

var Router = Ember.Router.extend({
  location: config.locationType
});

export default Router.map(function() {
	this.route('login', { path: '/login' });
	this.route('register', { path: '/register' });
	this.route('confirm', { path: '/confirm/:token'});

	this.route('forgot', { path: '/forgot'});
	this.route('change-password', { path: '/change-password/:token'});

	this.resource('admin', { path: '/admin' }, function () {

		this.resource('account', { path: '/account' }, function() {
			this.route('picture', { path: '/picture'});
		});

		this.resource('categories', { path: '/categories' }, function () {
			this.resource('category', { path: '/:category' }, function () {
				this.route('add_asset', { path: '/add'});
			});
		});

		this.resource('assets', { path: '/assets' }, function () {
			this.route('asset', { path: '/:id' });
		});
	});
});

template.hbs

{{#link-to 'category.index' 'electronics' tagName="h4" class="pointer"}}
    Electronics
{{/link-to}}