I have inherited a Symfony application where two OneToOne-entities share a primary key. This is modeled in two entity classes like this:

class A
{
    /**
     * @ORM\Id
     * @ORM\OneToOne(targetEntity="App\Entity\B", inversedBy="a", cascade={"persist"}, fetch="EAGER")
     * @ORM\JoinColumn(name="id", referencedColumnName="id", nullable=false)
     */
    private B $b;
}

and

class B
{
    /**
     * @ORM\Id
     * @ORM\GeneratedValue
     * @ORM\Column(type="integer")
     */
    private ?int $id = null;

    /**
     * @ORM\OneToOne(targetEntity="App\Entity\A", mappedBy="b", cascade={"persist"}, fetch="EAGER")
     */
    private A $a;
}

which is not ideal but mostly works. Now there is another entity which has a more “traditional” OneToOne doctrine relationship with A:

class C
{
    /**
     * @ORM\Id
     * @ORM\GeneratedValue
     * @ORM\Column(type="integer")
     */
    private ?int $id = null;

    /**
     * @ORM\OneToOne(targetEntity="App\Entity\A")
     */
    private ?A $a = null;
}

But as soon as I try to use the repository class for C to fetch a C entity with find(1) everything just falls apart: Typed property App\Entity\A::$b must be an instance of App\Entity\B, int used

I am pretty sure it is either https://github.com/doctrine/orm/issues/8255 or https://github.com/doctrine/orm/issues/8745 or probably both.

There are the versions of the libraries in my composer.lock:

doctrine/annotations                 1.13.2
doctrine/cache                       2.1.1                                                                
doctrine/collections                 1.6.8                                                                
doctrine/common                      3.2.2                                                                
doctrine/dbal                        2.13.8                                                               
doctrine/deprecations                v0.5.3                                                               
doctrine/doctrine-bundle             2.5.7                                                                
doctrine/doctrine-migrations-bundle  3.2.2                                                                
doctrine/event-manager               1.1.1                                                                
doctrine/inflector                   2.0.4                                                                
doctrine/instantiator                1.4.1                                                                
doctrine/lexer                       1.2.3                                                                
doctrine/migrations                  3.3.2                                                                
doctrine/orm                         2.10.5                                                               
doctrine/persistence                 2.4.0                                                                
doctrine/sql-formatter               1.1.2