public function getPossibleVariationsForProduct(Product $product)
{
$attributes = $product->getAttributes();
$this->createQueryBuilder($alias);
}
/**
*
* @param EntityManager $em
* @param Product $product
* @return ArrayCollection
*/
public static function generate(EntityManager $em, Product $product)
{
$productAttributes = $product->getAttributes();
$_instance = new self($em, $product);
return $_instance->factoryByProductAttributes($productAttributes);
}