用关联的对象数组刷新对象时出错

在持久化和刷新对象及其关联时收到以下错误消息:

Catchable Fatal Error: Argument 1 passed to
Doctrine'Common'Collections'ArrayCollection::__construct() must be of
the type array, object given, called in  
.../vendor/doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php on line 519 and defined in 
.../vendor/doctrine/common/lib/Doctrine/Common/Collections/ArrayCollection.php line 48

我有一个单表继承，这个作为基对象:

use Doctrine'ORM'Mapping as ORM;
/**
 * ObjectData
 *
 * @ORM'Table(name="object_data")
 * @ORM'Entity(repositoryClass="Edexp'CoreBundle'Entity'ObjectDataRepository")
 * @ORM'InheritanceType("SINGLE_TABLE")
 * @ORM'DiscriminatorColumn(name="entity_name", type="string")
 * @ORM'DiscriminatorMap({
 *      "request" = "Edexp'MessageBundle'Entity'RequestData"
 * })
 * @ORM'HasLifecycleCallbacks
 */
class ObjectData
{
/**
 * @var integer
 *
 * @ORM'Column(name="id", type="integer")
 * @ORM'Id
 * @ORM'GeneratedValue(strategy="AUTO")
 */
private $id;
/**
 * @var 'DateTime
 *
 * @ORM'Column(name="created_at", type="datetime")
 */
private $created_at;
/**
 * @var User
 *
 * @ORM'OneToMany(targetEntity="User", mappedBy="data")
 */
private $user;
/**
 * @var string
 *
 * @ORM'Column(name="`key`", type="string", length=255)
 */
private $key;
/**
 * @var string
 *
 * @ORM'Column(name="data", type="blob")
 */
private $data;
/**
 * Get id
 *
 * @return integer
 */
public function getId()
{
    return $this->id;
}
/**
 * Set created_at
 *
 * @param 'DateTime $createdAt
 * @return ObjectData
 */
public function setCreatedAt($createdAt)
{
    $this->created_at = $createdAt;
    return $this;
}
/**
 * Get created_at
 *
 * @return 'DateTime
 */
public function getCreatedAt()
{
    return $this->created_at;
}
/**
 * Set user
 *
 * @param User $user
 * @return ObjectData
 */
public function setUser($user)
{
    $this->user = $user;
    return $this;
}
/**
 * Get user
 *
 * @return User
 */
public function getUser()
{
    return $this->user;
}
/**
 * Set key
 *
 * @param string $key
 * @return ObjectData
 */
public function setKey($key)
{
    $this->key = $key;
    return $this;
}
/**
 * Get key
 *
 * @return string
 */
public function getKey()
{
    return $this->key;
}
/**
 * Set data
 *
 * @param string $data
 * @return ObjectData
 */
public function setData($data)
{
    $this->data = $data;
    return $this;
}
/**
 * Get data
 *
 * @return string
 */
public function getData()
{
    return $this->data;
}
/**
 * @ORM'PrePersist
 */
public function prepareForPersist()
{
    $this->created_at = new 'DateTime();
}
}

和从ObjectData继承的附加对象:

use Doctrine'ORM'Mapping as ORM;
use MyProject'CoreBundle'Entity'ObjectData;
/**
* RequestData
*
* @ORM'Entity()
*/
class RequestData extends ObjectData
{
    /**
    * var Request $request
    *
    * @ORM'ManyToOne(targetEntity="Request", inversedBy="data")
    * @ORM'JoinColumn(name="object_id", referencedColumnName="id")
    */
    private $request;
    /**
    * Set request
    *
    * @param Request $request
    * @return RequestData
    */
    public function setRequest($request)
    {
        $this->request = $request;
        return $this;
    }
    /**
    * Get request
    *
    * @return Request
    */
    public function getRequest()
    {
        return $this->request;
    }
}

下面是使用RequestData实体的对象:

use Doctrine'Common'Collections'ArrayCollection;
use Doctrine'ORM'Mapping as ORM;
/**
* Request
*
* @ORM'Table(name="requests")
* @ORM'Entity(repositoryClass="RequestRepository")
* @ORM'HasLifecycleCallbacks()
*/
class Request
{
    /**
    * @var integer $id
    *
    * @ORM'Column(name="id", type="integer")
    * @ORM'Id
    * @ORM'GeneratedValue(strategy="AUTO")
    */
    private $id;
    /**
    * @var Message $message
    *
    * @ORM'ManyToOne(targetEntity="Message", inversedBy="requests")
    */
    private $message;
    /**
    * @var RequestType $type
    *
    * @ORM'ManyToOne(targetEntity="RequestType")
    * @ORM'JoinColumn(name="type_id", referencedColumnName="id")
    */
    private $type;
    /**
    * @var ArrayCollection $data
    *
    * @ORM'OneToMany(
    *       targetEntity="RequestData",
    *       mappedBy="request",
    *       cascade={"persist","remove"}
    * )
    */
    private $data;
    /**
    * @var datetime $created_at
    *
    * @ORM'Column(name="created_at", type="datetime")
    */
    private $created_at;
    /**
    * @var text $comment
    *
    * @ORM'Column(name="comment", type="text")
    */
    private $comment;
    /**
    * @var ArrayCollection $responses
    *
    * @ORM'OneToMany(
    *       targetEntity="Response",
    *       mappedBy="request",
    *       cascade={"persist","remove"}
    * )
    */
    private $responses;
    public function __construct()
    {
        $this->data      = new ArrayCollection();
        $this->responses = new ArrayCollection();
    }
    /**
    * Get id
    *
    * @return integer
    */
    public function getId()
    {
        return $this->id;
    }
    /**
    * Set message
    *
    * @param Message $message
    */
    public function setMessage($message)
    {
        $this->message = $message;
    }
    /**
    * Get message
    *
    * @return Message
    */
    public function getMessage()
    {
        return $this->message;
    }
    /**
    * Set type
    *
    * @param RequestType $type
    */
    public function setType($type)
    {
        $this->type = $type;
    }
    /**
    * Get type
    *
    * @return RequestType
    */
    public function getType()
    {
        return $this->type;
    }
    /**
    * Set created_at
    *
    * @param datetime $createdAt
    */
    public function setCreatedAt($createdAt)
    {
        $this->created_at = $createdAt;
    }
    /**
    * Get created_at
    *
    * @return datetime
    */
    public function getCreatedAt()
    {
        return $this->created_at;
    }
    /**
    * Set comment
    *
    * @param text $comment
    */
    public function setComment($comment)
    {
        $this->comment = $comment;
    }
    /**
    * Get comment
    *
    * @return text
    */
    public function getComment()
    {
        return $this->comment;
    }
    /**
    * Add response
    *
    * @param Response $response
    */
    public function addResponse($response)
    {
        foreach ( $this->responses as $r ) {
            if ( $r->getUser() == $response->getUser() )
                return;
        }
        $this->responses->add($response);
    }
    /**
    * Get responses
    *
    * @return ArrayCollection
    */
    public function getResponses()
    {
        return $this->responses;
    }
    public function hasResponse($user)
    {
        foreach ( $this->responses as $r ) {
            if ( $r->getUser() == $user )
                return $r;
        }
        return null;
    }
    public function addData($data)
    {
        $data->setRequest($this);
        $this->data->add($data);
    }
    public function getData()
    {
        return $this->data;
    }
    /**
    * @ORM'PrePersist
    */
    public function prePersist()
    {
        $this->created_at = new 'DateTime();
    }
}

最后是导致错误的代码:

            use MyProject'MessageBundle'Entity'Request as MyRequest;
    $data = new RequestData();
    $data->setUser($user);
    $data->setKey('user_id');
    $data->setData(6);
    $req = new MyRequest();
    $req->setMessage($message);
    $req->setComment('bla');
    $req->setType($doctrine->getRepository('MessageBundle:RequestType')->find(1));
    $req->addData($data);
    $em->persist($req);
    $em->flush();

有什么建议吗?

欢呼