register controller using use case

Register.php

<?php

/* snip */
		$parser  = $app->get('user.parse.register');
		$usecase = $app->get('usecase.user.register');
		$params  = $this->request->post();

		try
		{
			$user = $parser($params);
			$userid = $usecase->interact($user);

			// TODO: this should forward to the login use case
			$this->redirect('user/login' . URL::query());
		}
		catch (Ushahidi\Exception\Validator $e)
		{
			$this->template = View::factory('user/register')
				->set('error', implode(', ', Arr::flatten($e->getErrors())))
				->set('form', $params);
		}