The annotation "#OneToMany" in property was never imported (Doctrine2) - php

Question

I'm working with Doctrine 2 as an ORM for Slim 3 but I keep getting stuck in the object mapping section when I try to implement a bidirectional relationship
/**
* Class Resource
* #package App
* #ORM\Entity
* #ORM\Table(name="users", uniqueConstraints={#ORM\UniqueConstraint(name="user_id", columns={"user_id"})}))
*/
class User
{
/**
* #ORM\ManyToOne(targetEntity="UserRoles", inversedBy="users")
* #ORM\JoinColumn(name="role_id", referencedColumnName="user_role_id")
*/
protected $user_role;
}
/**
* Class Resource
* #package App
* #ORM\Entity
* #ORM\Table(name="user_roles", uniqueConstraints={#ORM\UniqueConstraint(name="user_role_id", columns={"user_role_id"})}))
*/
class UserRoles
{
/**
* #ORM\OneToMany(targetEntity="User", mappedBy="user_role")
*/
protected $users;
public function __construct()
{
$this->users = new ArrayCollection();
}
}
I get an exception when I try php vendor/bin/doctrine orm:schema-tool:update --force
The output is:
[Doctrine\Common\Annotations\AnnotationException][Semantical Error] The annotation "#OneToMany" in property App\Entity\UserRoles::$users was never imported. Did you maybe forget to add a "use" statement for this annotation?

Answer 1

Doctrine classes like
Column
Entity
JoinColumn
ManyToMany
ManyToOne
OneToMany
OneToOne
Full list available on Github
are part of the Doctrine\ORM\Mapping namespace.
You should import this namespace with ORM as an alias. Then you should add #ORM in front of these classes as annotation to make them work.
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\ManyToOne(...)
* #ORM\JoinColumn(...)
*/
If you just want to use every single of those classes you have to import each separately.
use Doctrine\ORM\Mapping\ManyToOne;
use Doctrine\ORM\Mapping\JoinColumn;
/**
* #ManyToOne(...)
* #JoinColumn(...)
*/