invoiceninja/app/Http/Requests/Product/UpdateProductRequest.php

<?php
/**
 * Invoice Ninja (https://invoiceninja.com)
 *
 * @link https://github.com/invoiceninja/invoiceninja source repository
 *
 * @copyright Copyright (c) 2020. Invoice Ninja LLC (https://invoiceninja.com)
 *
 * @license https://opensource.org/licenses/AAL
 */

namespace App\Http\Requests\Product;

use App\Http\Requests\Request;
use App\Models\Product;
use App\Utils\Traits\ChecksEntityStatus;
use Illuminate\Support\Facades\Log;

class UpdateProductRequest extends Request
{
    use ChecksEntityStatus;
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */

    public function authorize() : bool
    {
        return auth()->user()->can('create', Product::class);
    }

    public function rules()
    {
  
        if ($this->input('documents') && is_array($this->input('documents'))) {
            $documents = count($this->input('documents'));

            foreach (range(0, $documents) as $index) {
                $rules['documents.' . $index] = 'file|mimes:png,ai,svg,jpeg,tiff,pdf,gif,psd,txt,doc,xls,ppt,xlsx,docx,pptx|max:20000';
            }
        } elseif ($this->input('documents')) {
            $rules['documents'] = 'file|mimes:png,ai,svg,jpeg,tiff,pdf,gif,psd,txt,doc,xls,ppt,xlsx,docx,pptx|max:20000';
        }

        $rules['cost'] = 'numeric';
        $rules['price'] = 'numeric';
        $rules['quantity'] = 'numeric';

        return $rules;
        
    }


    protected function prepareForValidation()
    {
        $input = $this->all();

        if (!isset($input['quantity']) || $input['quantity'] < 1) {
            $input['quantity'] = 1;
        }

        $this->replace($input);
    }
}