public function __construct()
 {
     $this->shapes = new ArrayCollection();
     $this->mainImage = new ArrayCollection();
     // Note: although it's a collection, we make sure that there's only one image present at all time
     parent::__construct();
 }
 public function __construct()
 {
     $this->questions = new \Doctrine\Common\Collections\ArrayCollection();
     parent::__construct();
 }