我已经在我的symfony包的Res​​ources / config / doctrine文件夹中使用yml-syntax创建了一个实体：

Sulu\Bundle\TranslateBundle\Entity\Translation:

type: entity

table: tr_translations

id:

code:

type: string

column: idCodes

associationKey: id

catalogue:

type: string

column: idCatalogues

associationKey: id

fields:

value:

type: text

manyToOne:

code:

targetEntity: Code

inversedBy: tr_codes

joinColumn:

name: idCodes

referencedColumnName: id

catalogue:

targetEntity: Catalogue

inversedBy: tr_catalogues

joinColumn:

name: idCatalogues

referencedColumnName: id

这部分工作正常.但是,当我像下面的代码中那样创建一些对象时,我收到一条错误消息,我必须使用flush方法才能获取外键的ID.

这是我当前使用的代码片段：

// create a new package and catalogue for the import

$package = new Package();

$package->setName($this->getName());

$catalogue = new Catalogue();

$catalogue->setLocale($this->getLocale());

$catalogue->setPackage($package);

$this->em->persist($package);

$this->em->persist($catalogue);

// load the file, and create a new code/translation combination for every message

$fileCatalogue = $loader->load($this->getFile(), $this->getLocale());

foreach ($fileCatalogue->all()['messages'] as $key => $message) {

$code = new Code();

$code->setPackage($package);

$code->setCode($key);

$code->setBackend(true);

$code->setFrontend(true);

$translate = new Translation();

$translate->setCode($code);

$translate->setValue($message);

$translate->setCatalogue($catalogue);

$this->em->persist($code);

$this->em->flush(); //FIXME no flush in between, if possible

$this->em->persist($translate);

}

// save all the changes to the database

$this->em->flush();

如果我没有在foreach循环中调用flush,则会收到以下错误,我完全理解,但是对于这个问题没有更好的解决方案吗？

Doctrine\ORM\ORMException : Entity of type

Sulu\Bundle\TranslateBundle\Entity\Translation has identity through a

foreign entity Sulu\Bundle\TranslateBundle\Entity\Code, however this

entity has no identity itself. You have to call

EntityManager#persist() on the related entity and make sure that an

identifier was generated before trying to persist

‘Sulu\Bundle\TranslateBundle\Entity\Translation’. In case of Post

Insert ID Generation (such as MySQL Auto-Increment or PostgreSQL

SERIAL) this means you have to call EntityManager#flush() between both

persist operations.

解决方法:

不幸的是,根据Doctrine Docs,您必须调用flush来获取外键的ID：

Generated entity identifiers / primary keys are guaranteed to be

available after the next successful flush operation that involves the

entity in question. You can not rely on a generated identifier to be

available directly after invoking persist. The inverse is also true.

You can not rely on a generated identifier being not available after a

failed flush operation.

标签：doctrine-orm,symfony,php,database

来源： https://codeday.me/bug/20191030/1968810.html