How to get Symfony clean URL after GET request - php

Question

I'm working on a small Symfony project and I came across an issue I don't know how to fix. I'm performing a database search via a GET request, and I'm looking for articles that are part of categories. I can select many categories and press "search", then it will return only the specific articles.
The feature is working great, but my URL isn't... "clean", I think. Working on localhost, this is what I see, for example, when I look for category "vocabulary":
localhost:8000/blog/?q=&categories[]=125
The q parameter is here to return articles when I look for a specific text (with an input field), but I think it shouldn't appear if the research only concerns categories. Right?
Also, display categories[]=125 is weird. The user should see something like categories=vocabulary&categories=grammar&categories... or something like this (of course, trying to avoid the repetition of "categories" in the URL.
How can I do this? This is what my code looks like in the repository:
/**
* Find articles related to search
*/
public function findSearch(SearchData $search): PaginationInterface
{
$query = $this
->createQueryBuilder('a')
->select('a', 'c')
->join('a.categories', 'c');
// Handling text search
if (null !== $search->q && !empty($search->q)) {
$query = $query
->andWhere('a.title LIKE :q')
->setParameter('q', "%{$search->q}%");
}
// Handling categories
if (!empty($search->categories)) {
$query = $query
->andWhere('c.id IN (:categories)')
->setParameter('categories', $search->categories);
}
$query = $query->getQuery();
return $this->paginator->paginate(
$query,
$search->page,
9
);
}
And here is what my controller looks like:
#[Route('/', name: 'blog_index')]
public function index(ArticleRepository $articleRepository, Request $request): Response
{
$data = new SearchData();
$data->page = $request->get('page', 1);
$form = $this->createForm(SearchType::class, $data);
$form->handleRequest($request);
$articles = $articleRepository->findSearch($data);
return $this->render('blog/index.html.twig', [
'form' => $form,
'articles' => $articles,
]);
}
If you need more info in order to help me, please ask.
Thanks in advance!