Symfony2教义FindOneOrCreate [英] Symfony2 doctrine FindOneOrCreate

问题描述

与推进我们有 findOneOrCreate（）

示例。

$bookTag = BookTagQuery::create()
->filterByBook($book)
->findOneOrCreate();   

在控制器中的任何地方，我们可以做这样的事情。

In doctrine anywhere in the controller We can do something like that.

...................
       $filename='something';
       $document_exists = $em->getRepository('DemoBundle:Document')
                ->findOneBy(array('filename' => $filename));

        if (null === $document_exists) {
            $document = new Document();
            $document->setFilename($filename);
            $em->persist($document);
            $em->flush();
        }    

在Doctrine还有另一种方法来实现吗？

Is there another way to achieve this in Doctrine?

可以在Entity Repository中调用Entity Manager吗？
任何建议？

Is it OK to call the Entity Manager inside the Entity Repository? Any suggestions?

推荐答案

最简单的方法是扩展基础仓库：

Easiest way is to extend the base repository:

// src/Acme/YourBundle/Entity/YourRepository.php
namespace Acme\YourBundle\Entity;

use Doctrine\ORM\EntityRepository;

class YourRepository extends EntityRepository
{
    public function findOneOrCreate(array $criteria)
    {
        $entity = $this->findOneBy($criteria);

        if (null === $entity)
        {
           $entity = new $this->getClassName();
           $entity->setTheDataSomehow($criteria); 
           $this->_em->persist($entity);
           $this->_em->flush();
        }

        return $entity
    }
}

然后告诉您的实体使用这个存储库或进一步扩展特定实体：

Then tell your entity to use this repository or extend in even further for specific entities:

// src/Acme/StoreBundle/Entity/Product.php
namespace Acme\StoreBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity(repositoryClass="Acme\YourBundle\Entity\YourRepository")
 */
class Product
{
    //...
}

并使用它在控制器中：

$em = $this->getDoctrine()->getManager();
$product = $em->getRepository('AcmeStoreBundle:Product')
              ->findOrCreate(array('foo' => 'Bar'));

资料来源： http://symfony.com/doc/current/book/doctrine.html#custom-repository-classes

只需要知道库中的 flush ，因为它将以这种方式刷新EntityManager中所有未保存的更改。

Just be aware of that flush inside the repository as it would flush all unsaved changes in the EntityManager this way.

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