course-site/app/Repositories/Criteria/Course/SubscribeCriteria.php

<?php

namespace App\Repositories\Criteria\Course;

use App\Repositories\Enums\ModelStatusEnum;
use Carbon\Carbon;
use Illuminate\Http\Request;
use Prettus\Repository\Contracts\CriteriaInterface;
use Prettus\Repository\Contracts\RepositoryInterface;

class SubscribeCriteria implements CriteriaInterface
{
    /**
     * @var \Illuminate\Http\Request
     */
    protected $request;

    public function __construct(Request $request)
    {
        $this->request = $request;
    }

    /**
     * @param $model
     * @param RepositoryInterface $repository
     *
     * @return mixed
     */
    public function apply($model, RepositoryInterface $repository)
    {

        if ($this->request->filled('user_id')) {
            $user_id = $this->request->get('user_id', 0);
            $model = $model->where('user_id', '=', $user_id);
        }

        if (!$this->request->filled('orderBy')) {
            $model = $model->orderByDesc('id');
        }

        if (isApi()) {
            $model = $model->where('user_id', login_user_id());
        }

        return $model;
    }
}