Duplicate definition of column 'id' on entity '<FQCN>' in a field or discriminator column mapping.

[Arkemlar]

BC Break Report

Q	A
BC Break	yes
Version	2.16.*

Summary

I use inheritance mapping and since v2.16 it is no longer working. Exact scheme example in the bottom.

Previous behavior

Worked fine.

Current behavior

In a newer version I got following error:
Duplicate definition of column 'id' on entity 'App\Context\Task\Model\TaskHistory' in a field or discriminator column mapping.

How to reproduce

abstract class Entity
{
    #[
        ORM\Id,
        ORM\GeneratedValue,
        ORM\Column(type: 'bigint', nullable: false, options: ['unsigned' => true])
    ]
    protected int $id;
}

#[
    ORM\Entity,
    ORM\InheritanceType('JOINED'),
    ORM\DiscriminatorMap([
        'task' => TaskHistory::class,
    ])
]
abstract class History extends Entity
{}


#[ORM\Entity]
class TaskHistory extends History
{}

Then bin/console doctrine:schema:validateif you use symfony.

If I move id field to History class, then it works as expected. Also works if I use trait for Id instead of abstract class.

I know that doctrine not guarantees plain old OOP classes inheritance to work but since it is BC break I decided to report it because it might indicate a new mapping bug.

[mpdude]

So the Entity class is intentionally not marked as an entity, and you know that this is out of supported configuration?

[mpdude]

Might be a duplicate of #11129

[Arkemlar]

So the Entity class is intentionally not marked as an entity, and you know that this is out of supported configuration?

Exactly! And I accent that I made this Issue not because it SHOULD work (it shouldn't), but because it is BC break.

[mpdude]

No, it’s not. It is unsupported, unspecified behavior and as such not subject to any promises given.