Symfony OneToMany Relationship检查插入新的子（Many）实体时是否存在主要（一个）实体

Question

Whenever I save a new child row, do I have to check if the parent ID actually exists manually? I would have thought that symfony/doctrine checks automatically and will throw an error b ecause of the OneToMany definition .

Example:

Main entity ("One"):

class Order
{
    /**
     * @var integer
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="IDENTITY")
     */
    private $id;

    /**
     * @ORM\OneToMany(targetEntity="OrderPayment", mappedBy="orderId")
     */
    private $orderPayments;



    public function __construct()
    {
        $this->orderPayments = new ArrayCollection();
    }

}

Child Entity ("Many"):

class OrderPayment
{
    /**
     * @ORM\ManyToOne(targetEntity="Order", inversedBy="orderPayments")
     * @ORM\JoinColumn(name="order_id", referencedColumnName="id")
     */
    private $orderId;

    /**
     * @var integer
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="IDENTITY")
     */
    private $id;

}

Whenever I insert a new OrderPayment line to the database, shouldn't Symfony check if the $orderId actually exists in the database or do I need to check manually?

Answer 1

It would be better to rename $orderId to $order . Doctrine sees the relations as Entity objects, not as integers. And yes, if you save the OrderPayment and the Order does not exist, Doctrine will throw an error!

When you renamed the properties, regenerated the Entity and updated the db scheme, add an order to an orderpayment like this:

$order = // get order from db
$orderPayment = new OrderPayment();
$orderPayment->setOrder($order);
$em->persist($orderPayment);
$em->flush();

Answer 2

You should pass your Order Entity itself into OrderPayment constructor, because OrderPayment can not exist without Order.

//OrderPayment
public function __construct(Order $order)
{
    $this->order = $order
    $this-createdAt = \DateTime::now();
}

//Controller or Service
$order = $orderRepository->getOrderBySomeField($field);
if ( ! $order){
    throw new HttpNotFoundException();
}
$orderPayment = new OrderPayment ($order);
$em->persist($orderPayment);
$em->flush;