[Form] By default a new project with `--webapp`flag creates app with Turbo enabled which changes the work with Forms, but this is never mentioned in the docs.

[yyaremenko]

According to current documentation, a new web project should be created with --webapp flag. In addition to other bundles, Symfony UX Turbo is installed. No warning is given to a developer in the documentation regarding that this bundle affects the way the forms are processed in a controller:

Here is official documentation on forms processing which gives an example of a controller.

Here is how forms are processed with Symfony UX Turbo is enabled, which requires to alter a controller code.

This confuses a developer, who follows the official docs on Forms and does not get a form working. A developer has to investigate why no changes take place after form is submitted.

[smnandre]

You may have missed the part explaining the described changes are only form versions older than 6.2. As Turbo is installed in --webapp since 6.4 you should not be concerned and can ignore them.

---

From the UX documentation:

If you're using Symfony 6.2+, the render() method takes care of this automatically:

From the Form documentation

By passing $form to the render() method (instead of $form->createView()), the response code is automatically set to HTTP 422 Unprocessable Content. This ensures compatibility with tools relying on the HTTP specification, like Symfony UX Turbo;

So both documentations suggest the same code currently, with nothing special to do in fact.

$form = $this->createForm( ... );

$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
    // ... 

    return $this->redirectToRoute('task_success');
}

return $this->render('task/new.html.twig', [
    'form' => $form,
]);

Now, i think we could/should remove this warning now (or make it less visible)