/**
  * Declares an association between this object and a Product object.
  *
  * @param             Product $v
  * @return UserProduct The current object (for fluent API support)
  * @throws PropelException
  */
 public function setProduct(Product $v = null)
 {
     if ($v === null) {
         $this->setProductId(NULL);
     } else {
         $this->setProductId($v->getId());
     }
     $this->aProduct = $v;
     // Add binding for other direction of this n:n relationship.
     // If this object has already been added to the Product object, it will not be re-added.
     if ($v !== null) {
         $v->addUserProduct($this);
     }
     return $this;
 }