商品詳細テーブルのEntity↓
/**
* @var \Customize\Entity\Product
*
* @ORM\ManyToOne(targetEntity="Customize\Entity\Product", inversedBy="ProductDetails")
* @ORM\JoinColumns({
* @ORM\JoinColumn(name="product_id", referencedColumnName="id")
* })
*/
private $Product;