教义/symfony2:尝试持久化多个元素时的异常

Question

我试图上传多次照片到一个产品，但它不工作，这个例外是：

 /**
 * @ORM\OneToMany(targetEntity="Photos", mappedBy="product")
 */
private $photos;

/**
 * @ORM\ManyToOne(targetEntity="Product", inversedBy="photos")
 * @ORM\JoinColumn(nullable=true)
 */
private $product;

......

$files = $form->get('photos')->getData(); // I use Transformer to transform data to Photos Entity
foreach($files as $list){
   foreach($list as $item){
        $product->addPhoto($item);
   }
}

$em->persist($product);
$eù->flush();

堆栈跟踪（纯文本）：

[1]条理\orm\ormException:在关联上找到类型为条理\common\collections\arrayCollection..\entity\product#photos的实体，但在C:..\vendor\dection\orm\lib\dection\orm\unitofwork.php第791行中需要portfolio\backend\backendbundle\entity\photos

at Doctrine\ORM\UnitOfWork->computeAssociationChanges(array('fieldName' => 'photos', 'mappedBy' => 'product', 'targetEntity' => '..\Entity\Photos', 'cascade' => array(), 'orphanRemoval' => false, 'fetch' => '2', 'type' => '4', 'inversedBy' => null, 'isOwningSide' => false, 'sourceEntity' => '..\Entity\Product', 'isCascadeRemove' => false, 'isCascadePersist' => false, 'isCascadeRefresh' => false, 'isCascadeMerge' => false, 'isCascadeDetach' => false), object(PersistentCollection))
    in C:\..\vendor\doctrine\orm\lib\Doctrine\ORM\UnitOfWork.php line 687

at Doctrine\ORM\UnitOfWork->computeChangeSet(object(ClassMetadata), object(Product))
    in C:\..\vendor\doctrine\orm\lib\Doctrine\ORM\UnitOfWork.php line 404

at Doctrine\ORM\UnitOfWork->computeScheduleInsertsChangeSets()
    in C:\..\vendor\doctrine\orm\lib\Doctrine\ORM\UnitOfWork.php line 711

at Doctrine\ORM\UnitOfWork->computeChangeSets()
    in C:\..\vendor\doctrine\orm\lib\Doctrine\ORM\UnitOfWork.php line 297

at Doctrine\ORM\UnitOfWork->commit(null)
    in C:\..\vendor\doctrine\orm\lib\Doctrine\ORM\EntityManager.php line 340

at Doctrine\ORM\EntityManager->flush()
    in C:\..\Controller\ProductController.php line 516

at ..\Controller\PostsController->createAction(object(Request))
    in  line 

at call_user_func_array(array(object(ProductController), 'createAction'), array(object(Request)))
    in C:\..\app\bootstrap.php.cache line 3094

at Symfony\Component\HttpKernel\HttpKernel->handleRaw(object(Request), '1')
    in C:\..\app\bootstrap.php.cache line 3056

at Symfony\Component\HttpKernel\HttpKernel->handle(object(Request), '1', true)
    in C:\..\app\bootstrap.php.cache line 3207

at Symfony\Component\HttpKernel\DependencyInjection\ContainerAwareHttpKernel->handle(object(Request), '1', true)
    in C:\..\app\bootstrap.php.cache line 2429

at Symfony\Component\HttpKernel\Kernel->handle(object(Request))
    in C:\..\web\app_dev.php line 28

对象（原则\common\collections\arraycollection)[509]私有“元素”=>数组(size=2)“文件”=>对象（原则\common\collections\arraycollection)[603]私有“元素”=>数组(size=1)...0=>对象(..\entity\medias)[740]私有“ID”=>null私有“文件”=>对象(symfony\component\httpfoundation\file\uploadedfile)[13]...私有“产品”=>null

你对这个例外有什么想法吗？

Answer 1

首先，您应该为@JoinColumn添加所有必需的属性：

/**
 * @ORM\ManyToOne(targetEntity="Product", inversedBy="photos")
 * @ORM\JoinColumn(name="product_id", referencedColumnName="id", nullable=true)
 */
private $product;

然后再次检查您的脚本。