class UnicornsController
{
    public function index($foo, $bar)
    {
        $this->set(
            array(
                'unicorn' => $this->Unicorn->findByFooAndBar($foo, $bar);
            )
        );
    }

    public function process()
    {
        $this->Unicorn->save($this->request->data);
        $this->redirect(
            'action' => 'index',
            $this->request->data['Unicor']['foo'],
            $this->request->data['Unicor']['bar'],
        );
    }
}