php - Doctrine 2 复合键和 DQL 连接

Question

我试图过滤掉父项由复合主键组成的子项，父项称为主题，子项是类(class):

主题:

class Subject
{
   /**
     * @var integer
     *
     * @Column(type="integer")
     * @Id
     * @GeneratedValue(strategy="NONE")
     */
    protected $id;

    /**
     * @var integer
     *
     * @Column(type="integer")
     * @Id
     */
    protected $customer_id;

    /**
     * @var ArrayCollection
     *
     * @OneToMany(targetEntity="Course", mappedBy="subject")
     */
    private $courses;

    ...
}

类(class):

class Course
{
    ...

    /**
     * @var Subject
     *
     * @ManyToOne(targetEntity="Subject", inversedBy="courses")
     * @JoinColumns({
     *   @JoinColumn(name="subject_id", referencedColumnName="id"),
     *   @JoinColumn(name="subject_customer_id", referencedColumnName="customer_id")
     * })
     */
    private $subject;
}

我有“subject_id”和“subject_customer_id”，我的问题是我无法在不加入主题的情况下过滤掉类(class)，当我写这个时:

$this->em->createQuery("SELECT c FROM Course c WHERE c.subject = :subject")
    ->setParameters( array('subject' => array( 'subject_id' => $subject_id, 'subject_customer_id' => $subject_customer_id ) ) )
    ->getResult();

我收到以下错误:

Doctrine\ORM\Query\QueryException [ 0 ]: A single-valued association path expression to an entity with a composite primary key is not supported. Explicitly name the components of the composite primary key in the query.

我能得到这个工作的唯一原因是通过内部连接主题，例如:

$this->em->createQuery("SELECT c FROM Course c INNER JOIN c.subject s WITH s.id = :subject AND s.customer_id = :customer")
    ->setParameters( array( 'subject' => $subject_id, 'customer' => $customer_id ) )
    ->getResult();

有没有办法在不加入学科的情况下根据学科主键检索类(class)？

Answer 1

截至当前日期，此逻辑为 not yet supported by DQL (另请参见 https://github.com/doctrine/doctrine2/blob/2.3.2/lib/Doctrine/ORM/Persisters/BasicEntityPersister.php#L1641-L1643)。

你必须加入类似这样的东西:

SELECT
    c
FROM
    Course c
INNER JOIN 
    c.subject s 
WHERE 
    s.id = :subject 
    AND 
    s.customer_id = :customer

考虑通过最终添加这样的逻辑来为项目做出贡献:它可能会合并到新的 2.4 系列中。