Sindbad~EG File Manager

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use App\Models\User;
use App\Models\UserClass;
use App\Models\Classes;
use App\Models\UserQuestionnaireResponse;

class Classes extends Model
{
    use HasFactory;

    protected $fillable = [
        'year_id',
        'category_id',
        'quiz_released_number',
        'name',
    ];

    public function year()
    {
        return $this->belongsTo(ClassesYear::class, 'year_id');
    }

    public function category()
    {
        return $this->belongsTo(ClassesCategory::class, 'category_id');
    }

    public function students()
    {
        return $this->belongsToMany(User::class, 'users_classes', 'class_id', 'user_id');
    }
}