course-site/app/Repositories/Models/School/LessonTeacher.php

<?php

namespace App\Repositories\Models\School;

use App\Repositories\Enums\ModelStatusEnum;
use App\Repositories\Models\Base\Admin;
use App\Repositories\Models\Model;
use Carbon\Carbon;
use Prettus\Repository\Contracts\Transformable;
use Prettus\Repository\Traits\TransformableTrait;

/**
 * Class Room.
 *
 * @package namespace App\Repositories\Models\School;
 */
class LessonTeacher extends Model implements Transformable
{
    use TransformableTrait;

    protected $table = 'school_lesson_teacher';

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $guarded = [];

    public function lesson()
    {
        return $this->belongsTo(Lesson::class)->select(['id', 'name', 'lesson_hour', 'credit']);
    }

    public function teacher()
    {
//        return $this->belongsTo(Teacher::class)->select(['id', 'name', 'account']);
        return $this->belongsTo(Admin::class, 'teacher_admin_id')->select(['id', 'name', 'username']);
    }

    public function getProgressAttribute()
    {
        $id = $this->attributes['id'];
        $total = LessonSchedule::query()->where('lesson_teacher_id', $id)->where('status', ModelStatusEnum::OK)->count();
        $current = LessonSchedule::query()->where('lesson_teacher_id', $id)->where('day', '<', date('Y-m-d'))->where('status', ModelStatusEnum::OK)->count();
        if (!$total) return 0;
        return round($current / $total * 100);
    }

    public function grade()
    {
        return $this->belongsTo(Grade::class)->select(['id', 'name']);
    }

}