如何从实体获取反应物？ [英] How to get a Respository from an Entity?

问题描述

我有一个实体名为游戏与相关的存储库名为 GameRepository ：

I have an Entity called Game with a related Repository called GameRepository:

/**
 * @ORM\Entity(repositoryClass="...\GameRepository")
 * @ORM\HasLifecycleCallbacks()
 */
class Game {
    /**
     * @ORM\prePersist
     */
    public function setSlugValue() {
        $this->slug = $repo->createUniqueSlugForGame();
    }
}

在prePersist方法中，我需要确保Game's slug字段是唯一的，它需要一个数据库查询。要查询，我需要访问 EntityManager 。我可以从GameRepository里面获取EntityManager。所以：如何从游戏中获取GameRespository？

In the prePersist method, I need to ensure that the Game's slug field is unique, which requires a database query. To do the query, I need access to the EntityManager. I can get the EntityManager from inside GameRepository. So: how do I get the GameRespository from a Game?

推荐答案

你不会。 Doctrine 2中的实体应该是不知道实体经理或存储库。

You don't. Entities in Doctrine 2 are supposed to not know of the entity manager or the repository.

对于您出现的情况，典型的解决方案是向用于创建（或调用存储）新实例的存储库（或服务类）添加一种方法，并生成唯一的段值。

A typical solution to the case you present would be to add a method to the repository (or a service class) which is used to create (or called to store) new instances, and also produces a unique slug value.

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