Laravel package bug in ModelMetadata

[mariantrifu]

API Platform Laravel package version(s) affected: 4.1.* and 4.2.*

Description
When a Laravel Model has a BelongsToMany relationship, I see this bug:

ErrorException
vendor/api-platform/laravel/Eloquent/Metadata/ModelMetadata.php:80

array_flip(): Can only flip string and integer values, entry skipped

Laravel version: 12, php version 8.4, api-platform/laravel version 4.1 and 4.2

Possible Solution
In ModelMetadata, on line 80 there is this line:
$foreignKeys = array_flip(array_column($relations, 'foreign_key'));
I've changed it to this line:
$foreignKeys = array_flip(array_filter(array_column($relations, 'foreign_key')));

It looks like API Platform library tries to extract the foreign_key from all relations, but BelongsToMany relations don't have a getForeignKeyName() method, so it returns null. When API Platform tries to flip an array containing null values, PHP throws the error: array_flip(): Can only flip string and integer values, entry skipped.

[soyuka]

Hi thanks! Would you be able to provide a pull request?

[mariantrifu]

I'll create a PR and let you know when ready.

[mariantrifu]

@soyuka this is the PR #7589 , hope it's ok created.