module-exam/app/Models/Application.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasOne;

class Application extends Model
{
    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class);
    }
    public function application(): HasOne
    {
        return $this->hasOne(Application::class);
    }
}