education-project/app/Models/Timetable.php

<?php

namespace App\Models;

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

class Timetable extends Model
{
    use HasFactory;

    protected $guarded = [
        'updated_at',
    ];

    protected $hidden = [
        'created_at',
        'updated_at',
    ];

    public function teacher()
    {
        return $this->belongsTo(Teacher::class);
    }

    public function schoolClass()
    {
        return $this->belongsTo(SchoolClass::class,'class_id');
    }

    public function subject()
    {
        return $this->belongsTo(Subject::class);
    }

}