spa-js-api/app/Models/UserRegistration.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class UserRegistration extends Model
{
    use HasFactory;

    protected $guarded = [];

    public $timestamps = false;

    public function registration()
    {
        return $this->belongsTo(Registration::class);
    }

    public function user()
    {
        return $this->belongsTo(User::class);
    }


}