ldc-dam/app/Models/Langue.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Langue extends Model
{
    /**
     * The primary key associated with the table.
     *
     * @var string
     */
    protected $primaryKey = 'langue_id';

    // * METHODS

    /**
     * Get default language instance
     *
     * @return self
     * @throws \RuntimeException If fetching default language fails.
     */
    public static function getDefaultLang(): self
    {
        return self::whereLangueId(1)->first() ??
            throw new \RuntimeException('Failed to fetch default language');
    }
}