area-point-api/app/Repositories/Models/Course/Chapter.php

<?php

namespace App\Repositories\Models\Course;

use App\Repositories\Models\Model;
use Jenssegers\Mongodb\Eloquent\SoftDeletes;
use Prettus\Repository\Contracts\Transformable;
use Prettus\Repository\Traits\TransformableTrait;

/**
 * Class CourseChapter.
 *
 * @package namespace App\Repositories\Models;
 */
class Chapter extends Model implements Transformable
{
    use TransformableTrait;
    use SoftDeletes;
    protected $table = 'course_chapters';
    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = ['title', 'sort', 'status', 'course_id'];

    protected static function booted()
    {
        self::language();
    }

    public function videos()
    {
        return $this->hasMany(Video::class, 'course_chapter_id', 'id');
    }

    public function course()
    {
        return $this->belongsTo(Course::class)->select(['id', 'title']);
    }

}