course-site/app/Repositories/Models/Course/Subscribe.php

<?php

namespace App\Repositories\Models\Course;

use App\Repositories\Models\Base\Admin;
use App\Repositories\Models\Model;

class Subscribe extends Model
{
    /**
     * @var string
     */
    protected $table = 'course_subscribes';

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */

    protected $guarded = [];

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

    public function user()
    {
        return $this->belongsTo(Admin::class, 'user_id', 'id')->select(['id', 'name', 'username', 'mobile']);
    }
}