Doctrine 2 Mapping of 2 tables, error - php

Question

Zend Framework 3, Doctrine 2. I created some mapping of 2 tables MySQL
/**
* #ORM\Entity
* #ORM\Table(name="object")
*/
class Object
{
/**
* #ORM\Id
* #ORM\GeneratedValue
* #ORM\Column(name="id")
*/
protected $id;
/**
* #ORM\OneToOne(targetEntity="..\Host", inversedBy="object")
* #ORM\JoinColumn(name="ip", referencedColumnName="IP")
*/
protected $host;
}
/**
* #ORM\Entity
* #ORM\Table(name="host")
*/
class Host
{
/**
* #ORM\Id
* #ORM\Column(name="IP")
*/
protected $ip;
/**
* #ORM\OneToOne(targetEntity="..\Object", mappedBy="host")
* #ORM\JoinColumn(name="IP", referencedColumnName="ip")
*/
protected $object;
}
I have this error:
Error "Missing value for primary key id on ..\Object".
Why? It seems to be done according to the example -> 5.3. One-To-One, Bidirectional from the site Doctrine

Answer 1

The parameters you pass to JoinColumn are incorrect. You can check the doc for JoinColumn here.
Try like this:
// For Object class:
// #ORM\JoinColumn(name="host_ip", referencedColumnName="ip")
// For Host class
// #ORM\JoinColumn(name="object_id", referencedColumnName="id")
In addition to this: mappedBy is not supported in OneToOne annotations. You can use targetEntity and inversedBy but not mappedBy.
On the other hand, making the ip your primary key seems wrong. You should have an auto-generated primary id for Host and use that to connect the entities. You can still set you ip field as unique, so you won't have duplicates. Plus you don't have any other fields, you can even just put the ip within Object class.
Also, I don't recommend using Object as your class name. It is too general.