/**
  * - Validate the user is allowed to be here.
  * - Redirect if no user id is set in the session.
  * - Set any messages that need to be displayed.
  *
  * @return void
  */
 public function __construct()
 {
     if ($_SERVER['HTTP_HOST'] != 'local.restaurants.com') {
         $this->loadView('404');
     }
     if (!isset($_SESSION['user']['id'])) {
         header('Location: /signin/');
         exit;
     }
     $this->db = new Db();
     $this->user_id = $_SESSION['user']['id'];
     $business = new Business($this->db);
     $this->business_id = $business->getIdFromUserId($this->user_id);
 }