Bug (?) by using ResponseTrait within a filter

Hi,

i want to use the ResponseTrait in a filter but i get the following error:

Undefined property: App\\Filters\\BackendAuth::$response"

This is my filter:

PHP Code:

namespace App\Filters;

use CodeIgniter\Filters\FilterInterface;
use CodeIgniter\HTTP\RequestInterface;
use CodeIgniter\HTTP\RequestTrait;
use CodeIgniter\HTTP\ResponseInterface;
use CodeIgniter\API\ResponseTrait;

class BackendAuth implements FilterInterface {
    use ResponseTrait;
    public function before(RequestInterface $request, $arguments = null)
    {
        
        // Do something here
    }

    public function after(RequestInterface $request, ResponseInterface $response, $arguments = null)
    {
        
        return $this->failUnauthorized();
    }
} 


ResponseTrait is not intended to use with filters.
It is for controllers.

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper

ResponseTrait is not intended to use with filters.
It is for controllers.

Ok, thank you.
I want to check globally in my controller if access is allowed or not. Thats why i tried at first to use the Response Trait in the constructor of my controller but this is not working.

Is it right, that some things, if used in the constructor, not work as expected? The Response Trait is one thing and the setHeader method does not set the header if i use it in the constructor.

Is it right, that some things, if used in the constructor, not work as expected?

It does not work as expected.
Because the constructor cannot return a Response object.
Controller should return a Response object.

And in a filter, what you do is just return the Response object that you want.
See https://codeigniter4.github.io/CodeIgnit...ponse.html

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper

It does not work as expected.
Because the constructor cannot return a Response object.
Controller should return a Response object.

And in a filter, what you do is just return the Response object that you want.
See https://codeigniter4.github.io/CodeIgnit...ponse.html

@kenjis thanks for the clarification. Then the correct way is to use a filter for things (not only the access check) i want to execute every time the controller is executed?