Doctrine ManyToMany对同一实体重复条目错误

Question

我必须将相同的字段与不同的参数相关联.

多对多:

/**
 * @ORM\ManyToMany(targetEntity="BRCN\TaxonomyBundle\Entity\Taxonomy", mappedBy="genderCategories")
 */
private $genders;

/**
 * @ORM\ManyToMany(targetEntity="BRCN\TaxonomyBundle\Entity\Taxonomy", inversedBy="genders")
 * @ORM\JoinTable(name="menu_relations",
 *      joinColumns={@ORM\JoinColumn(name="gender_id", referencedColumnName="id")},
 *      inverseJoinColumns={@ORM\JoinColumn(name="category_id", referencedColumnName="id")}
 *      )
 */
private $genderCategories;

这些变量在同一个表"id"中使用相同的列名.

当我查看"menu_relations"表时,我看到两个与我的参数关联的主键.

当我尝试插入新记录时,我收到此错误:

使用参数[94,1]执行'INSERT INTO menu_relations(gender_id,category_id)VALUES(？,？)'时发生异常:

SQLSTATE [23000]:完整性约束违规:1062键'PRIMARY'的重复条目'94 -1'

插入值:

if($request->isXmlHttpRequest()) {
    $categories = $request->request->get('category');

    foreach($categories as $key => $value) {

        /** @var $gender \BRCN\TaxonomyBundle\Entity\Taxonomy */
        $gender = $em->find('BRCNTaxonomyBundle:Taxonomy', $key);

        if($gender) {

            foreach($value as $category) {
                $category = $em->find('BRCNTaxonomyBundle:Taxonomy', $category);

                $gender->addGenderCategory($category);
                $em->persist($gender);
            }

            $em->flush();
        }

    }

    return JsonResponse::create([
        'status' => true,
        'message' => '?li?kilendirme Ba?ar?l?'
     ]);
}

Answer 1

您可以利用Doctrine的索引关联来避免添加重复的关系.

下面将指数的代码$genderCategories通过category_id,所以它永远不会包含多个类别具有相同的ID.

请注意注释中的indexBy属性.

/**
 * @ORM\ManyToMany(targetEntity="BRCN\TaxonomyBundle\Entity\Taxonomy", inversedBy="genders", indexBy="id")
 * @ORM\JoinTable(name="menu_relations",
 *      joinColumns={@ORM\JoinColumn(name="gender_id", referencedColumnName="id")},
 *      inverseJoinColumns={@ORM\JoinColumn(name="category_id", referencedColumnName="id")}
 *      )
 */
private $genderCategories;

public addGenderCategory($category) {
    $this->genderCategories[$category->getId()] = $category;
}

边注

我建议将persist呼叫拉出你的循环以提高性能.

foreach($value as $category) {
    $category = $em->find('BRCNTaxonomyBundle:Taxonomy', $category);
    $gender->addGenderCategory($category);
}

$em->persist($gender);