将引用与继承一起使用时出现奇怪的Doctrine ODM异常 [英] Weird Doctrine ODM exception when using references together with inheritance

问题描述

我有三节课。 File-Class引用了Foobar，Game继承自Foobar。还有一些其他类也从Foobar继承，但我把它们排除在外，因为它们在这里不相关。我还省略了一些不相关的领域和他们的吸气剂和制定者。

I've got three classes. The File-Class has a reference to Foobar and Game inherits from Foobar. There are some other Classes which also inherit from Foobar but i left them out as they aren't relevant here. I also left out some unrelevant fields and their getters and setters.

计划是每个游戏都有两个图像，mainImage和secondaryImage。我把这些字段放到了一个单独的类中，游戏继承了这个类，因为我也需要它们用于其他几个类。

The plan is that every Game has two images, the mainImage and the secondaryImage. I've put those fields into a seperate class from which Game inherits because i need them for a few other classes too.

我的问题是，如果我加载游戏数据库一旦我尝试迭代它们我得到以下异常：

My problem is that if I load the games from the database as soon as i try to iterate over them I get the following exception:

注意：未定义的索引：在C：\ xampp中\htdocs\Symfony\vendor\doctrine\mongodb-odm\lib\Doctrine\ODM\MongoDB\Mapping\ClassMetadataInfo.php线1293

Notice: Undefined index: in C:\xampp\htdocs\Symfony\vendor\doctrine\mongodb-odm\lib\Doctrine\ODM\MongoDB\Mapping\ClassMetadataInfo.php line 1293

有关参考这里是ClassMetadataInfo.php的线

For reference here are the lines of ClassMetadataInfo.php

public function getPHPIdentifierValue($id)
{
    $idType = $this->fieldMappings[$this->identifier]['type'];
    return Type::getType($idType)->convertToPHPValue($id);
} 

这是我的课程

文件类：

namespace Project\MainBundle\Document;

use Doctrine\ODM\MongoDB\Mapping\Annotations as MongoDB;

/**
 * @MongoDB\Document
 */
class File
{

    /**
     * @MongoDB\Id(strategy="INCREMENT")
     */
    protected $id;

    /**
     * @MongoDB\ReferenceOne(targetDocument="Foobar", inversedBy="mainImage")
     */
    private $mainImage;

    /**
     * @MongoDB\ReferenceOne(targetDocument="Foobar", inversedBy="secondaryImage")
     */
    private $secondaryImage;



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


    public function setMainImage($mainImage)
    {
        $this->mainImage = $mainImage;
        return $this;
    }
    public function getMainImage()
    {
        return $this->mainImage;
    }


    public function setSecondaryImage($secondaryImage)
    {
        $this->secondaryImage = $secondaryImage;
        return $this;
    }
    public function getSecondaryImage()
    {
    return $this->secondaryImage;
    }


}

Foobar-Class ：

Foobar-Class:

namespace Project\MainBundle\Document;

use Doctrine\ODM\MongoDB\Mapping\Annotations as MongoDB;

/**
 * @MongoDB\MappedSuperclass
 */
abstract class Foobar
{

    /**
     * @MongoDB\Id(strategy="INCREMENT")
     */
    protected $id;



    /**
     * @MongoDB\ReferenceOne(targetDocument="File", mappedBy="mainImage")
     */
    protected $mainImage;

    /**
     * @MongoDB\ReferenceOne(targetDocument="File", mappedBy="secondaryImage")
     */
    protected $secondaryImage;



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


    /**
     * Set mainImage
     */
    public function setMainImage($file)
    {
        $file->setMainImage($this);
        $this->mainImage = $file;
        return $this;
    }
    /**
     * Get mainImage
     */
    public function getMainImage()
    {
        return $this->mainImage;
    }


    /**
     * Set secondaryImage
     */
    public function setSecondaryImage($file)
    {
        $file->setSecondaryImage($this);
        $this->secondaryImage = $file;
        return $this;
    }
    /**
     * Get secondaryImage
     */
    public function getSecondaryImage()
    {
        return $this->secondaryImage;
    }


}

游戏级：

namespace Project\MainBundle\Document;

use Doctrine\ODM\MongoDB\Mapping\Annotations as MongoDB;

/**
 * @MongoDB\Document
 */
class Game extends Foobar
{

    /**
     * @MongoDB\String
     */
    private $name;



    /**
     * Set name
     */
    public function setName($name)
    {
        $this->name = $name;
        return $this;
    }
    /**
     * Get name
     */
    public function getName()
    {
        return $this->name;
    }


}

虽然没有真的很重要，但这是我要执行的功能：

Though it doesn't really matter but here is my function i want to execute:

    $dm = $this->get('doctrine_mongodb')->getManager();

    $games_all = $dm->getRepository("ProjectMainBundle:Game")->createQueryBuilder()->sort('id', 'ASC')->getQuery()->execute();

    foreach ($games_all as $singlegame) { // it breaks here
        // Here i would do stuff
    }

这是Doctrine ODM中的错误还是我做错了什么？这些课程是否正确？我已经尝试了一切，但它不会工作。

Is this a bug in Doctrine ODM or am I doing something wrong? Are the classes correct? I have tried everything but it just wont work.

推荐答案

我认为你的问题为时已晚，但也许还有其他问题具有相同问题的用户（和我一样）。

I think it is too late for your question, but maybe there are other users having the same problem (as me).

问题与Foobar是MappedSuperclass有关。如在 https://github.com/doctrine/由你描述有同样的问题mongodb-odm / issues / 241 。

The problem is related to Foobar being a MappedSuperclass. Had the same problem as described by you and at https://github.com/doctrine/mongodb-odm/issues/241.

解决方案是不引用抽象类Foobar（= MappedSuperclass），而是引用具体实现（= Document） - as在你的情况下 - 游戏。

Solution is to not reference the abstract class Foobar (=MappedSuperclass) but a concrete implementation (=Document) - as in your case - Game.

另见 Doctrine ODM返回基类的代理对象而不是子类文档

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