如何删除具有两个关系的“反向实体”

Posted 2023-04-12

【中文标题】如何删除具有两个关系的“反向实体”

【英文标题】：How to delete an 'inverse-side entiy' with two relations

【发布时间】：2019-04-06 15:43:20

【问题描述】：

销售、库存和目录之间存在双向关系。 销售和库存，应该有一个目录条目。但是这个 目前情况并非总是如此......所以这些关系是“可空的”。

class Sale 

    /**
     * @ORM\ManyToOne(targetEntity="App\Entity\Stock", inversedBy="sales")
     */
    private $stock;

    public function getCatalog(): ?Catalog
    
        return $this->catalog;
    

    public function setCatalog(?Catalog $catalog): self
    
        $this->catalog = $catalog;

        return $this;
    


class Stock

    /**
     * @ORM\OneToOne(targetEntity="App\Entity\Catalog", inversedBy="stock")
     */
    private $catalog;

    public function getCatalog(): ?Catalog
    
        return $this->catalog;
    

    public function setCatalog(?Catalog $catalog): self
    
        $this->catalog = $catalog;

        return $this;
    


class Catalog

    /**
     * @ORM\OneToMany(targetEntity="App\Entity\Sale", mappedBy="catalog")
     */
    private $sales;

    /**
     * @ORM\OneToOne(targetEntity="App\Entity\Stock", mappedBy="catalog")
     */
    private $stock;

    public function addSale(Sale $sale): self
    
        if (!$this->sales->contains($sale)) 
            $this->sales[] = $sale;
            $sale->setCatalog($this);
        

        return $this;
    

    public function removeSale(Sale $sale): self
    
        if ($this->sales->contains($sale)) 
            $this->sales->removeElement($sale);
            // set the owning side to null (unless already changed)
            if ($sale->getCatalog() === $this) 
                $sale->setCatalog(null);
            
        

        return $this;
    

    public function getStock(): ?Stock
    
        return $this->stock;
    

    public function setStock(?Stock $stock): self
    
        $this->stock = $stock;

        // set (or unset) the owning side of the relation if necessary
        $newCatalog = $stock === null ? null : $this;
        if ($newCatalog !== $stock->getCatalog()) 
            $stock->setCatalog($newCatalog);
        

        return $this;
    

所有这些都是在 Symfony 中使用 make:entity 自动生成的。整理的时候 目录，也需要删除目录条目。

class CatalogController extends AbstractController 


    /**
     * @Route(
     *     path    = "/catalog-delete/id<[1-9]\d*>",
     *     name    = "catalog_delete",
     *     methods = "GET"
     * )
     */
    public function delete(int $id)
    
        // get catalog
        $catalog = $this->catalogRepository->find($id);
        if (!$catalog) 
            throw $this->createNotFoundException($this->translator->trans('system.error.notfound') . $id);
        

        // delete
        $this->entityManager->remove($catalog);
        $this->entityManager->flush();

        return $this->redirectToRoute('catalog_list');
    

到目前为止非常简单。但是我如何删除关联，而不删除 任何股票或销售？我确实遇到了这样的错误（不删除关联）

Cannot delete or update a parent row: a foreign key constraint fails (`symfony`.`sale`, CONSTRAINT `FK_E54BC005DCD6110` FOREIGN KEY (`stock_id`) REFERENCES `stock` (`id`))

或者喜欢

Call to a member function getCatalog() on null

当我在函数 delete() 中尝试时；)

$catalog->setStock(null);
foreach($catalog->getSales() as $sale) 
    $catalog->getSales()->removeElement($sale); // ????????

我可以使用 DQL 来设置 category_id 销售和库存为空（更新销售/库存 SET category_id = null WHERE category_id = X）。 但我认为这不是常见的“orm 方式”。

对于这种情况，自动生成的函数对我来说有点奇怪 还有这里的学说文档 https://www.doctrine-project.org/projects/doctrine-orm/en/2.6/reference/working-with-associations.html#removing-associations

我读过，只有拥有方负责关联， 但是我如何获得我的功能 Stock 和 all Sales，如果有的话？

抱歉，问题很长，而且是一个基本主题。

谢谢你和最好的问候

---

我的问题被标记为重复。主要区别是

我想在我的问题中了解如何实现函数调用以将拥有的实体（两个或多个）设置为空。删除过程。哪个实体，什么样的电话。只添加

@ORM\JoinColumn(name="catalog_id", referencedColumnName="id", onDelete="SET NULL")  

（旧答案）不解决问题。

--------- DQL 解决方法 ----------

// Controller

/**
 * @Route(
 *     path    = "/catalog-delete/id<[1-9]\d*>",
 *     name    = "catalog_delete",
 *     methods = "GET"
 * )
 */
public function delete(int $id)

    // get catalog
    $numDeleted = $this->catalogRepository->delete($id);
    if (!$numDeleted) 
        throw $this->createNotFoundException($this->translator->trans('system.error.notfound') . $id);
    

    return $this->redirectToRoute('catalog_list');


// Repository

/**
 * Delete with associations
 */
public function delete(int $id): int

    $this->getEntityManager()
        ->createQuery(/** @lang DQL */'
            UPDATE App\Entity\Sale s 
               SET s.catalog = NULL
             WHERE s.catalog = :id 
        ')
        ->setParameter('id', $id)
        ->execute()
    ;

    $this->getEntityManager()
        ->createQuery(/** @lang DQL */'
            UPDATE App\Entity\Stock s 
               SET s.catalog = NULL
             WHERE s.catalog = :id 
        ')
        ->setParameter('id', $id)
        ->execute()
    ;

    $numDeleted = $this->getEntityManager()
        ->createQuery(/** @lang DQL */'
            DELETE FROM App\Entity\Catalog c
                  WHERE c.id = :id 
        ')
        ->setParameter('id', $id)
        ->execute()
    ;

    return $numDeleted;

我最长的帖子；）

【问题讨论】：

Doctrine 2 OneToMany Cascade SET NULL的可能重复

【参考方案1】：

解决方案确实是这个简单的设置。它也可以是单向关系。

class Sale 

    /**
     * @ORM\ManyToOne(targetEntity="App\Entity\Stock")
     * @ORM\JoinColumn(onDelete="SET NULL")
     */
    private $stock;

    public function getCatalog(): ?Catalog
    
        return $this->catalog;
    

    public function setCatalog(?Catalog $catalog): self
    
        $this->catalog = $catalog;

        return $this;
    


class Stock

    /**
     * @ORM\OneToOne(targetEntity="App\Entity\Catalog")
     * @ORM\JoinColumn(onDelete="SET NULL")
     */
    private $catalog;

    public function getCatalog(): ?Catalog
    
        return $this->catalog;
    

    public function setCatalog(?Catalog $catalog): self
    
        $this->catalog = $catalog;

        return $this;
    


class Catalog

然后控制器功能运行良好。昨天我尝试了太多东西......