Can't update or delete dynamically with twig and php oop

Question

I\'m learning php oop and I\'m going crazy with this ...

I want to update my database with a form in my website.

I create my model like this :

Answer 1

Is your add function does work with the same system ?

Could try this

public function updatePost() {
    $manager = new PostsManager($this->db);
    if($_SERVER['REQUEST_METHOD'] == 'POST'){
        $p = new Post($_POST);
        $manager->update($p);
    }
}

Or maybe your id is empty