invoiceninja/app/Http/Requests/Credit/UpdateCreditRequest.php

<?php

namespace App\Http\Requests\Credit;

use App\Utils\Traits\ChecksEntityStatus;
use App\Utils\Traits\CleanLineItems;
use App\Utils\Traits\MakesHash;
use Illuminate\Foundation\Http\FormRequest;

class UpdateCreditRequest extends FormRequest
{
    use MakesHash;
    use CleanLineItems;
    use ChecksEntityStatus;

    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize() : bool
    {
        return auth()->user()->can('edit', $this->credit);
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'documents' => 'mimes:png,ai,svg,jpeg,tiff,pdf,gif,psd,txt,doc,xls,ppt,xlsx,docx,pptx',
            //'client_id' => 'required|integer',
            //'invoice_type_id' => 'integer',
        ];
    }

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

        if (isset($input['client_id'])) {
            $input['client_id'] = $this->decodePrimaryKey($input['client_id']);
        }

        $input['line_items'] = isset($input['line_items']) ? $this->cleanItems($input['line_items']) : [];

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