Question

我搜索了几个小时来找到这个问题的解决方案，但没有运气。

也许这是重复的帖子，但我找不到它。

所以，我在 Symfony的服务中遇到问题，当我调用实体管理器clear($entityname)方法时，我收到了这个错误：

Warning: Illegal offset type in isset or empty.

我不知道为什么会这样。

如果我评论clear()方法，一切正常。

首先，我致电ProductController

public function postProductAction(Request $request)
{
    if($jsonData = $this->requestToArray($request)){
        $productHandler = $this->get("admin.product_handler");
        $insertNews = $productHandler->insert($jsonData);
        if($insertNews === true) {
            return $this->jsonResponse->setData(array(
            "status" => true, "msg" => MessageConstants::SUCCESS_SEND_DATA));
        }
    }
    $this->jsonResponse->setStatusCode(204);
    return $this->jsonResponse->setData(
    array("status" => false, "msg" => MessageConstants::FAILED_RECEIVE_RESPONSE));
}

然后致电设置新产品的ProductHandler

 $productRepo = new Products();
 $productRepo->setCarmodels(json_encode($data['ModelId']));
 $productRepo->setCategoryid($category);
 $productRepo->setDescription($data['Description']);
 $productRepo->setDiscount($data['Discount']);
 $productRepo->setDiscountprice($data['DiscountPrice']);
 $this->em->persist($productRepo);
 $this->em->flush($productRepo);
 $insertOther = $this->update($productRepo->getId(), $data);
 $this->em->clear($productRepo);

insertAnotfer调用更新，因为有一些操作需要获取产品ID，所以我需要先插入然后再做更新。

$product = $productRepo->find((int)$id);
$product->setCarmodels(json_encode($data['ModelId']));
$product->setCategoryid($category);
$product->setDescription($data['Description']);
$product->setDiscount($data['Discount']);
$product->setDiscountprice($data['DiscountPrice']);

在更新中我也称为clear方法

$this->em->flush($product);
$this->em->clear($product);

然后我收到此错误。我试图从更新中删除明确的方法，但没有运气。仅当我在插入函数中设置了没有实体的clear()方法时，才会触发错误。

Answer 1

EntityManager :: clear方法采用实体类型的名称，而不是实体的实际实例：

<强> \学说\ ORM \ EntityManager的：

 /**
 * Clears the EntityManager. All entities that are currently managed
 * by this EntityManager become detached.
 *
 * @param string|null $entityName if given, only entities of this type will get detached
 *
 * @return void
 */
public function clear($entityName = null)
{
    $this->unitOfWork->clear($entityName);
}

看起来你需要的是分离 - 将实体实例与实体管理器解除关联的正确方法：

http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/working-with-objects.html#detaching-entities

<强> \学说\ ORM \ EntityManager的：

 /**
 * Detaches an entity from the EntityManager, causing a managed entity to
 * become detached.  Unflushed changes made to the entity if any
 * (including removal of the entity), will not be synchronized to the database.
 * Entities which previously referenced the detached entity will continue to
 * reference it.
 *
 * @param object $entity The entity to detach.
 *
 * @return void
 *
 * @throws ORMInvalidArgumentException
 */
public function detach($entity)
{
    if ( ! is_object($entity)) {
        throw ORMInvalidArgumentException::invalidObject('EntityManager#detach()' , $entity);
    }

    $this->unitOfWork->detach($entity);
}

Answer 2

我不相信你应该在flush或clear函数中指定参数。

您是否尝试过这样做（没有实体作为参数）：

$this->em->flush();
$this->em->clear();

我不确定这是否对您有用，但您可以尝试一下，看看是否有帮助吗？我可能错了，所以如果有人有更好的建议，请发帖。

isset中的非法偏移类型或空的Doctrine清除

2 个答案: