级联持久存在Doctrine2和Symfony2的问题

Question

我使用Symfony2作为我的应用程序,我使用两个实体管理器,如One用于读取,其他用于写入.

我正在创建实体管理器对象:

$em = $this->getDoctrine()->getEntityManager('write');
$em = $this->getDoctrine()->getEntityManager('read');

最初它工作正常,但现在出现以下错误:

通过关系' AppBundle\Entity\ProfileViewer#viewer' 找到了一个新实体,该关系未被配置为对实体进行级联持久操作:shamsi.明确保留新实体或在关系上配置级联持久操作.

这是我的ProfileViewer实体:

/**
 * AppBundle\Entity\ProfileViewer
 *
 * @ORM\Table(name="profile_viewer")
 * @ORM\Entity
 */
class ProfileViewer
{
/**
 * @var bigint $id
 *
 * @ORM\Column(name="id", type="bigint", nullable=false)
 * @ORM\Id
 * @ORM\GeneratedValue(strategy="IDENTITY")
 */
private $id;

/**
 * @var bigint $userId
 *
 * @ORM\Column(name="user_id", type="bigint", nullable=false)
 */
private $userId;

/**
 * @var datetime $viewedAt
 *
 * @ORM\Column(name="viewed_at", type="datetime", nullable=true)
 */
private $viewedAt;

 /**
 * @ORM\ManyToOne(targetEntity="user", inversedBy="viewers")
 * @ORM\JoinColumn(name="viewer_id", referencedColumnName="id")
 */
private $viewer;

public function __construct()
{
    $this->viewedAt = new \DateTime();      
}
 /**
 * Get id
 *
 * @return bigint 
 */
public function getId()
{
    return $this->id;
}

/**
 * Set userId
 *
 * @param bigint $userId
 */
public function setUserId($userId)
{
    $this->userId = $userId;
}

/**
 * Get UserId
 *
 * @return bigint 
 */
public function getUserId()
{ 
    return $this->userId;
}

/**
 * Set viewedAt
 *
 * @param datetime $viewedAt
 */
public function setViewedAt($viewedAt)
{
    $this->viewedAt = $viewedAt;
}

/**
 * Get viewedAt
 *
 * @return datetime 
 */
public function getViewedAt()
{
    return $this->viewedAt;
}

/**
 * Set viewer
 *
 * @param AppBundle\Entity\User $viewer
 */
public function setViewer(AppBundle\Entity\User $viewer)
{
    $this->viewer = $viewer;
}

/**
 * Get viewer
 *
 * @return AppBundle\Entity\User
 */
public function getViewer()
{
    return $this->viewer;
}

}

当我创建了2个实体管理器时,会出现此错误.我被困在这里请帮帮我...

Answer 1

默认情况下,Doctrine2中没有级联操作.

您可以添加cascade={"persist"}到您的关联:

 /**
 * @ORM\ManyToOne(targetEntity="user", inversedBy="viewers", cascade={"persist"})
 * @ORM\JoinColumn(name="viewer_id", referencedColumnName="id")
 */

您可以阅读本文以了解对学说中的关联的级联操作.这一点很重要:

级联操作在存储器中执行.这意味着集合和相关实体被提取到内存中,即使它们在即将执行级联操作时仍被标记为延迟.但是,此方法允许为每个操作执行实体生命周期事件.

但是,在级联中将对象图形拉入内存会导致 相当大的性能开销,尤其是在级联集合较大时.确保权衡您定义的每个级联操作的优点和缺点.