Php 持久化一个实体并将其与另一个实体关联，而不会再次分散第二个实体

我正在用Durandal/Knockoutjs构建一个前端应用程序，用Symfony2构建一个web服务后端，我使用Doctrine访问数据库

我有两个实体，它们是一对多的关联，就像这样

use Doctrine\ORM\Mapping as ORM;

/**
 *  @ORM\Entity
 *  @ORM\Table(name = "drew_cat_door")
 */
class Door
{
    public function __construct()
    {
        //$this->setAddTime(new \DateTime(date('Y-m-d H:i:s')));

        if ($this->getAddTime() == null)
            $this->setAddTime(new \DateTime(date('Y-m-d H:i:s')));
        else
            $this->setUpdateTime(new \DateTime(date('Y-m-d H:i:s')));
    }

    /**
     *  @ORM\Id
     *  @ORM\Column(type = "integer")
     *  @ORM\GeneratedValue(strategy = "AUTO")
     */
    protected $id;

    /**
     *  @ORM\Column(type = "string", length = 30)
     */
    protected $name;

    /**
     *  @ORM\ManyToOne(targetEntity = "DoorType", inversedBy = "doors")
     *  @ORM\JoinColumn(name = "type_id", referencedColumnName = "id")
     */
    protected $type;

    /**
     *  @ORM\Column(type = "string", length = 30, nullable = true)
     */
    protected $filename;

    /**
     *  @ORM\Column(type = "string", length = 100, nullable = true)
     */
    protected $description;

    /**
     *  @ORM\Column(type = "integer", nullable = true)
     */
    protected $views;

    /**
     *  @ORM\Column(type = "datetime")
     */
    protected $add_time;

    /**
     *  @ORM\Column(type = "datetime", nullable = true)
     */
    protected $update_time;

    /**
     * Get id
     *
     * @return integer 
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set name
     *
     * @param string $name
     * @return Door
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Get name
     *
     * @return string 
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Set filename
     *
     * @param string $filename
     * @return Door
     */
    public function setFilename($filename)
    {
        $this->filename = $filename;

        return $this;
    }

    /**
     * Get filename
     *
     * @return string 
     */
    public function getFilename()
    {
        return $this->filename;
    }

    /**
     * Set description
     *
     * @param string $description
     * @return Door
     */
    public function setDescription($description)
    {
        $this->description = $description;

        return $this;
    }

    /**
     * Get description
     *
     * @return string 
     */
    public function getDescription()
    {
        return $this->description;
    }

    /**
     * Set views
     *
     * @param integer $views
     * @return Door
     */
    public function setViews($views)
    {
        $this->views = $views;

        return $this;
    }

    /**
     * Get views
     *
     * @return integer 
     */
    public function getViews()
    {
        return $this->views;
    }

    /**
     * Set add_time
     *
     * @param \DateTime $addTime
     * @return Door
     */
    public function setAddTime($addTime)
    {
        $this->add_time = $addTime;

        return $this;
    }

    /**
     * Get add_time
     *
     * @return \DateTime 
     */
    public function getAddTime()
    {
        return $this->add_time;
    }

    /**
     * Set update_time
     *
     * @param \DateTime $updateTime
     * @return Door
     */
    public function setUpdateTime($updateTime)
    {
        $this->update_time = $updateTime;

        return $this;
    }

    /**
     * Get update_time
     *
     * @return \DateTime 
     */
    public function getUpdateTime()
    {
        return $this->update_time;
    }

    /**
     * Set type
     *
     * @param \Drewkol\AdminBundle\Entity\DoorType $type
     * @return Door
     */
    public function setType(\Drewkol\AdminBundle\Entity\DoorType $type = null)
    {
        $this->type = $type;

        return $this;
    }

    /**
     * Get type
     *
     * @return \Drewkol\AdminBundle\Entity\DoorType 
     */
    public function getType()
    {
        return $this->type;
    }
}

/**
 *  @ORM\Entity
 *  @ORM\Table(name = "drew_cat_doortype")
 */
class DoorType
{
    public function __construct()
    {
        $this->doors = new ArrayCollection();

        if ($this->getAddTime() == null)
            $this->setAddTime(new \DateTime(date('Y-m-d H:i:s')));
        else
            $this->setUpdateTime(new \DateTime(date('Y-m-d H:i:s')));
    }
    /**
     *  @ORM\Id
     *  @ORM\Column(type = "integer")
     *  @ORM\GeneratedValue
     */
    protected $id;

    /**
     *  @ORM\Column(type = "string", length = 30)
     */
    protected $name;

    /**
     *  @ORM\OneToMany(targetEntity = "Door", mappedBy = "type")
     */
    protected $doors;

    /**
     *  @ORM\Column(type = "datetime")
     */
    protected $add_time;

    /**
     *  @ORM\Column(type = "datetime", nullable = true)
     */
    protected $update_time;

    /**
     * Get id
     *
     * @return integer 
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set name
     *
     * @param string $name
     * @return DoorType
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Get name
     *
     * @return string 
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Set add_time
     *
     * @param \DateTime $addTime
     * @return DoorType
     */
    public function setAddTime($addTime)
    {
        if ($addTime != null)
            $this->add_time = $addTime;

        return $this;
    }

    /**
     * Get add_time
     *
     * @return \DateTime 
     */
    public function getAddTime()
    {
        return $this->add_time;
    }

    /**
     * Set update_time
     *
     * @param \DateTime $updateTime
     * @return DoorType
     */
    public function setUpdateTime($updateTime)
    {
        $this->update_time = $updateTime;

        return $this;
    }

    /**
     * Get update_time
     *
     * @return \DateTime 
     */
    public function getUpdateTime()
    {
        return $this->update_time;
    }

    /**
     * Add doors
     *
     * @param \Drewkol\AdminBundle\Entity\Door $doors
     * @return DoorType
     */
    public function addDoor(\Drewkol\AdminBundle\Entity\Door $doors)
    {
        $this->doors[] = $doors;

        return $this;
    }

    /**
     * Remove doors
     *
     * @param \Drewkol\AdminBundle\Entity\Door $doors
     */
    public function removeDoor(\Drewkol\AdminBundle\Entity\Door $doors)
    {
        $this->doors->removeElement($doors);
    }

    /**
     * Get doors
     *
     * @return \Doctrine\Common\Collections\Collection 
     */
    public function getDoors()
    {
        return $this->doors;
    }
}

很抱歉没有输入任何代码。正如您所看到的，门有一个门类型

很简单，在添加门时，我会发布一个JSON

{"name":"nowe","type":{"id":5,"name":"loluk","add_time":"2013-09-25T01:05:05+0200"},"description":"hehe\n","filename":"hehe.jpg"}

是一个完整的门实体模型，其类型已经存在。当我试图用此代码添加此实体时

$json_door = $this->get("request")->getContent();
if (empty($json_door))
    return $this->createBadRequestException();

$door = $this->container->get("serializer")
    ->deserialize($json_door, "Drewkol\\AdminBundle\\Entity\\Door", "json");
$door->setAddTime(new \DateTime(date('Y-m-d H:i:s')));

$manager = $this->getDoctrine()->getManager();
$manager->persist($door);
$manager->flush();

我得到一个错误，上面写着

A new entity was found through the relationship 'Drewkol\AdminBundle\Entity\Door#type' that was not configured to cascade persist operations for entity: Drewkol\AdminBundle\Entity\DoorType@000000002d1b74500000000063b1c8fb. To solve this issue: Either explicitly call EntityManager#persist() on this unknown entity or configure cascade persist this association in the mapping for example @ManyToOne(..,cascade={"persist"}). If you cannot find out which entity causes the problem implement 'Drewkol\AdminBundle\Entity\DoorType#__toString()' to get a clue. 

我的问题是：添加已添加类型的门的最干净和有效的方法是什么

---

如果要添加的实体中给定的类型已经存在于数据库中（之前必须添加），是否有任何方法可以告诉Doctrine尝试并解决该问题，或者我必须从JSON反序列化实体中获取并删除该类型以防止其持久化（使用建议的级联选项）然后用条令获取类型，然后将其设置为我的全新反序列化门实体的类型，这样条令就知道该类型了？我的意思是，我喜欢由knockoutjs生成并用JSON传输的数据模型，在我看来，这是一个普遍的缺点，无法按照我介绍的方式进行

我建议使用Doctrine

prePersist

事件来处理此问题。在

prePersist

事件中，您需要编写一些逻辑来检查数据库，以确定

doorType

是否存在

如果它存在，那么从数据库中获取

doorType

，并使用它来代替取消序列化JSON时创建的

doorType

对象

如果它不存在，请持久化从未序列化的敲除JSON创建的

doorType

，然后持久化

Door