Php YML映射参考

解析存储实体“producer”，该实体包括具有属于此实体的翻译的数组

成功保存数据库。但是，在包含翻译的表中，缺少到“producer”表的链接

这一结果：

我的制作人：

+----+----+
| id |code|
+----+----+
| 1  |abcd|
+----+----+

我的制作人翻译

+----+-----------+----+------+
| id |id_producer|name|locale|
+----+-----------+----+------+
| 1  |    NULL   |abcd|  en  |
+----+-----------+----+------+
| 2  |    NULL   |abcd|  de  |
+----+-----------+----+------+

实体生成翻译

ProducerTranslation
{
    protected $id;
    protected $name;
    protected $producer;
    protected $locale;

    ... getters and setters
}

实体生产者

Producer
{
    protected $id;
    protected $code;
    protected $translations;

    public function __construct()
    {
        $this->translations = new ArrayCollection;
    }

    ... getters and setters, method for adding translations (entity ProductTranslation)
}

生产者YML

My\ProducerBundle\Entity\Producer:
  type: entity
  table: my_producer
  id:
    id:
      type: integer
      generator:
        strategy: AUTO
  fields:
    code:
      type: string
      length: 50
      nullable: true

  oneToMany:
    translations:
      targetEntity: ProducerTranslation
      mappedBy: producer
      cascade: ["persist", "remove"]

生产者翻译

My\ProducerBundle\Entity\ProducerTranslation:
  type: entity
  table: my_producer_translations
  id:
    id:
      type: integer
      generator:
        strategy: AUTO
  fields:
    name:
      type: string
      length: 100
    locale:
      type: text
      length: 2

  manyToOne:
    producer:
      targetEntity: Producer
      inversedBy: translations
      joinColumn:
        name: producer_id
        referencedColumnName: id
        onDelete: CASCADE

---

在ProducerTranslation中的存储集生产者之前

$ProducerTranslation->setProducer（$Producer）

为什么ProducerTranslation.id\u producer允许空值