小编Tae*_*ram的帖子

我有三个Doctrine实体:Device,它与Device\Status具有OneToOne关系,后者与Device\Status\Battery具有OneToOne关系.

我在相关实体之间设置了{cascade ="persist"},并且从我读过的内容中,应该是Doctrine自动保存每个实体所需的全部内容,而无需在代码中自行执行任何操作.

这是我遇到的问题:

$device = new \Entities\Device();
$device->setId(100);

$status = $device->getStatus();
$status->setIpAddress('192.168.0.1');

$battery = $status->getBattery();
$battery->setInternalLevel(60);

$em->persist($device);
$em->flush();

执行此代码后,我收到以下错误:

Entity of type Device\Status\Battery has identity through a foreign entity 
Device\Status, 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 'Device\Status\Battery'. In case of 
Post Insert ID Generation (such as MySQL Auto-Increment or PostgreSQL SERIAL) 
this means you have to call …