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Dir : ~/home/id/ebook.dev-unit.com/Modules/Ebook/Filters/

View File Name : EbookFilter.php

<?php

namespace Modules\Ebook\Filters;

use Illuminate\Http\Request;

class EbookFilter
{
    private $request;
    private $queryStringFilter;

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

    public function apply($query)
    {
        $query = $query->forCard();

        foreach ($this->filters() as $name => $value) {
            if (! is_null($value)) {
                $this->queryStringFilter->{$name}($query, $value);
            }
        }

        return $query;
    }

    private function filters()
    {
        return array_filter($this->request->query(), function ($filter) {
            return $this->filterExists($filter);
        }, ARRAY_FILTER_USE_KEY);
    }

    private function filterExists($filter)
    {
        return method_exists($this->queryStringFilter, $filter) &&
            is_callable([$this->queryStringFilter, $filter]);
    }
}