Question

我的博客有3个实体，如下所示：

项：

namespace Entities\Blog;

/**
 * @Entity(repositoryClass="\Entities\Blog\EntryRepository")
 * @Table(name="blog_entry")
 * @HasLifecycleCallbacks
 */
class Entry extends \Entities\AbstractEntity
{
    /**
     * @Id @Column(name="id", type="integer")
     * @GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /** @Column(name="permalink", type="string", length=255) */
    protected $permalink;

    /** @Column(name="title", type="string", length=255) */
    protected $title;

    /** @Column(name="pub_date", type="datetime") */
    protected $pub_date;

    /** @Column(name="content", type="text") */
    protected $content;

    /** @OneToMany(targetEntity="\Entities\Blog\Comment", mappedBy="entry") */
    protected $comments;

     /**
     * @ManyToMany(targetEntity="\Entities\Blog\Category", cascade={"persist", "remove"})
     * @JoinColumn(name="id", referencedColumnName="id",onDelete="SET NULL", onUpdate="SET NULL")
     */
    protected $entrycategories;

    public function addEntry($entry) {
        $this->entrycategories->add($entry);
    }
    public function deleteDiscoverFromCategories($entry) {
        $this->entrycategories->removeElement($entry);
    }
    public function getCategories() {
        $this->entrycategories;
    }


    /** @Column(type="datetime") */
    private $created_at;

    /** @Column(type="datetime") */
    private $updated_at;

    /** @PreUpdate */
    public function updated()
    {
        $this->updated_at = new \DateTime("now");
    }

    public function __construct()
    {
      $this->entrycategories = new \Doctrine\Common\Collections\ArrayCollection();
        $this->comments = new \Doctrine\Common\Collections\ArrayCollection();

        $this->created_at = $this->updated_at = new \DateTime("now");
    }
}

class EntryRepository extends \Entities\PaginatedRepository
{
    protected $_entityClassName = 'Entities\Blog\Entry';
}

类别权利：

命名空间实体\ Blog;

/**
 * @Entity(repositoryClass="\Entities\Blog\CategoryRepository")
 * @Table(name="blog_Ccategory")
 * @HasLifecycleCallbacks
 */
class Category extends \Entities\AbstractEntity
{
    /**
     * @Id @Column(name="id", type="integer")
     * @GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /** @Column(name="permalink", type="string", length=255) */
    protected $permalink;

    /** @Column(name="cat_title", type="string", length=255) */
    protected $title;
     /** @ManyToMany(targetEntity="\Entities\Blog\Entry", mappedBy="entrycategories", cascade={"all"})
     */
    protected $entries;
    public function __construct()
    {
        $this->comments = new \Doctrine\Common\Collections\ArrayCollection();
        $this->entries = new \Doctrine\Common\Collections\ArrayCollection();
        $this->created_at = $this->updated_at = new \DateTime("now");
    }
}

class EntryRepository extends \Entities\PaginatedRepository
{
    protected $_entityClassName = 'Entities\Blog\Entry';
}

和评论：

namespace Entities\Blog;

/**
 * @Entity(repositoryClass="\Entities\Blog\CommentRepository")
 * @Table(name="blog_comment")
 * @HasLifecycleCallbacks
 */
class Comment extends \Entities\AbstractEntity
{
    /**
     * @Id @Column(name="id", type="integer")
     * @GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @ManyToOne(targetEntity="\Entities\Blog\Entry")
     * @JoinColumn(name="entry_id", referencedColumnName="id")
     */
    protected $entry;

    /** @Column(name="approved", type="string", length=255) */
    protected $approved;

    /** @Column(name="title", type="string", length=255) */
    protected $title;

    /** @Column(name="content", type="text") */
    protected $content;

    /** @Column(name="pub_date", type="datetime") */
    protected $pub_date;

    /** @Column(type="datetime") */
    private $created_at;

    /** @Column(type="datetime") */
    private $updated_at;

    /** @PreUpdate */
    public function updated()
    {
        $this->updated_at = new \DateTime("now");
    }

    public function __construct()
    {
        $this->created_at = $this->updated_at = new \DateTime("now");
    }
}

class CommentRepository extends \Entities\PaginatedRepository
{
    protected $_entityClassName = 'Entities\Blog\Comment';
}

我可以完美地添加评论和条目..所以，现在我已经添加了一个类别实体来对条目等进行分类..所以，doctrine现在创建了一个多对多的表，我也可以添加数据而没有任何问题。像这样：

 $getEntry = $entryRepo->find(1);     
$getCat= $this->_doctrine->getReference('\Entities\Blog\Category', cat['id']);
        $getEntry->addEntry($getCat);
        $this->em->flush();

作品！..

但是如何删除我对多对多表格的这个条目？我试过一切...... 我看了看dopctrine 2的文档，然后一点也没有......也没有错误。

我试过了：

$getCat= $cateRepo->find(1);
$getEntry = $entryRepo->find(1);  
$getEntry->getCategories()->removeElement($getCat);
$this->em->flush();

也在类别实体上尝试了这个：

$getCat= $cateRepo->find(1);
$getEntry = $entryRepo->find(1);  
$getCat->entries()->removeElement($getEntry);
$this->em->flush();

每次我加载页面时，它都不会显示任何错误，也不会删除链接辅助前面他多对多的表

Answer 1

根据Doctrine documentation，您需要从两个实体中删除关联。你尝试过两种方法的组合吗？即。

$getCat= $cateRepo->find(1);
$getEntry = $entryRepo->find(1); 

// Remove the Category -> Entry association 
$getCat->entries()->removeElement($getEntry);

// Remove the Entry -> Category association
$getEntry->getCategories()->removeElement($getCat);

// Persist the changes
$this->em->flush();

doctrine 2，无法从db中删除引用

1 个答案: