/**
  * @param \Saxulum\Entity\Product $one
  * @param bool $stopPropagation
  * @return $this
  */
 public function setOne(\Saxulum\Entity\Product $one = null, $stopPropagation = false)
 {
     if (!$stopPropagation) {
         if (null !== $this->one) {
             $this->one->removeMany($this, true);
         }
         if (null !== $one) {
             $one->addMany($this, true);
         }
     }
     $this->one = $one;
     return $this;
 }