Symfony

Question

我正在做一个用 Symfony 3.1.10 制作的项目。

我有三个实体：

我的实体 1->n 我的数据透视实体

MyPivotEntity n->1 MySuperInheritanceEntity

我还有另一个实体 MyInheritanceEntity，它继承自 MySuperInheritanceEntity，具有 single_table 继承

https://www.doctrine-project.org/projects/doctrine-orm/en/2.6/reference/inheritance-mapping.html#single-table-inheritance

我在 MyEntityType 表单中创建了 MyPivotEntity 的 CollectionType 字段，但是当我从控制器创建表单时，我收到内存超出消息，因为构建器为每个 MySuperInheritanceEntity 执行数据库请求。我怎样才能防止这种情况发生？在这种情况下，我根本不需要 MySuperInheritanceEntity 信息，我只需要 MyPivotEntity 字段

<?php 

/**
 * MyEntity
 *
 * @ORM\Table(name="my_entity")
 * @ORM\Entity()
 */
class MyEntity {
    /**
     * @ORM\OneToMany(targetEntity="MyPivotEntity", mappedBy="myEntity", cascade={"persist"})
     */
    private $myPivotEntity;
}

/**
 * MyPivotEntity
 *
 * @ORM\Table(name="my_pivot_entity")
 * @ORM\Entity()
 */
class MyPivotEntity {
    /**
     * @ORM\ManyToOne(targetEntity="MyEntity", inversedBy="myPivotEntity", cascade={"persist"})
     */
    private $myEntity;

    /**
     * @ORM\ManyToOne(targetEntity="MySuperInheritanceEntity", inversedBy="myPivotEntity", cascade={"persist"})
     */
    private $mySuperInheritanceEntity;
}

/**
 * MySuperInheritanceEntity
 *
 * @ORM\Table(name="my_super_inheritance_entity")
 * @ORM\Entity()
 * @ORM\InheritanceType("SINGLE_TABLE")
 */
class MySuperInheritanceEntity {
    /**
     * @ORM\OneToMany(targetEntity="MyPivotEntity", mappedBy="mySuperInheritanceEntity")
     */
    private $myPivotEntity;
}

/**
 * MyInheritanceEntity
 *
 * @ORM\Table(name="my_inheritance_entity")
 * @ORM\Entity()
 */
class MyInheritanceEntity extends MySuperInheritanceEntity {

}

class MyEntityType extends AbstractType
{
    /**
     * {@inheritdoc}
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('myPivotEntity', CollectionType::class, [
                'entry_type' => MyPivotEntityType::class
            ]);
    }
}


class MyPivotEntityType extends AbstractType
{
    /**
     * {@inheritdoc}
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('somField');
    }
}

class MyController extends Controller {
    /**
     * @Post("/myEntity/update")
     */
    public function postMyEntityUpdateAction(Request $request, MyEntity $myEntity) {
        $form = $this->createForm(MyEntityType::class, $myEntity);

        // here error 500 because of too mach memory
        // caused by the MyPivotEntityType which runs a request for each entry,
        // trying to retrieve all the information about MySuperInheritanceEntity and MyInheritanceEntity
        // even if I don't need it at all
        // because of the @ORM\InheritanceType("SINGLE_TABLE")
        // deleting the inheritance solves the problem, but I need it

        $form->handleRequest($request);

        if ($form->isValid()) {
            $this->getEm()->flush();
            return ['success' => true];
        }

        $errors = (string) $form->getErrors(true, false);
        throw new HttpException(400, $errors);
    }
}

Answer 1

文档 says:

There is a general performance consideration with Single Table Inheritance: If the target-entity of a many-to-one or one-to-one association is an STI entity, it is preferable for performance reasons that it be a leaf entity in the inheritance hierarchy, (ie. have no subclasses).

另请注意：

对 OneToMany 关联属性名称使用复数名称：

class MyEntity {
        /**
         * @ORM\OneToMany(targetEntity="MyPivotEntity", mappedBy="myEntity", cascade={"persist"})
         */
        private $myPivotEntities;
}

更新

作为替代方法，您可能会完全忘记继承并拥有单独的（以前是子的）实体，所有属性和关联都已复制。

Symfony - Doctrine Single Table 与父实体的继承 ManyToOne 关联

Symfony - Doctrine Single Table Inheritance ManyToOne association with parent entity

php

symfony-forms

symfony-3.1

更新