ET-VISA/app/Models/Appointment.php

<?php

namespace App\Models;

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

class Appointment extends Model
{
    use HasFactory;

    protected $guarded = ['id'];

    public function appointment_booking_detail(){
        return $this->hasOne(AppointmentBookingDetail::class);
    }
}