Filter.php

<?php declare(strict_types=1);

namespace App\Http\Api\Filters;

use Illuminate\Database\Eloquent\Builder;
use Illuminate\Http\Request;

abstract class Filter
{
    protected Request $request;
    protected Builder $builder;

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

    public function filters(): array
    {
        return $this->request->keys();
    }

    public function apply(Builder $builder): Builder
    {
        $this->builder = $builder;

        foreach ($this->filters() as $fieldName) {
            $value = $this->request->get($fieldName);
            if ($value && method_exists($this, $fieldName)) {
                $this->$fieldName($value);
            }
        }

        return $this->builder;
    }
}