Handle PUT requests with Symfony 4 Form - symfony

Question

I used to use edit and update methods in my controller to submit and handle a PUT form submission. It works fine and the code looks like this,
public function edit(Category $category): Response
{
$form = $this->createForm(CategoryType::class, $category, [
'action' => $this->generateUrl('category_update', [
'id' => $category->getId(),
]),
'method' => 'PUT',
]);
return $this->render('category/edit.html.twig', [
'category_form' => $form->createView(),
]);
}
public function update(Category $category, Request $request): Response
{
$form = $this->createForm(CategoryType::class, $category, ['method' => 'PUT']);
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
$entityManager = $this->getDoctrine()->getManager();
$entityManager->flush();
return new Response('', Response::HTTP_NO_CONTENT);
}
return new Response('', Response::HTTP_BAD_REQUEST);
}
As PUT is not supported by HTML forms, the edit request uses POST with a '_method' parameter as 'PUT' instead of a real PUT request.
Now I want to remove the edit method and send a real PUT request from the frontend. When I used Postman to test this, I found the update method cannot handle a real PUT request.
When I use Postman to send POST + '_method'='PUT' requests, it works fine, but when I send PUT requests, it shows BAD_REQUEST, which is the last line in my code. isSubmitted() returns false.
I know I don't need to use Forms here, but it's been used in the store method. Is it possible to use it to handle a real PUT request? What should I change in my update method?

Answer 1

Seems like you're missing $entityManager->merge($category); in the update() method. Try adding it above $entityManager->flush(); and let us know if it works.

Answer 2

You need to write _method instead of method
$form = $this->createForm(CategoryType::class, $category, ['_method' => 'PUT']);
Also you need to persist object, before flushing