Process GET in Symfony-Form is always empty - forms

Question

I try to implement a searchform in my Symfony-Application. POST works fine, but I want to use /search?q=foo. I have a form with method=GET but I can't bind my Request to the Form with the following Request:
search?form%5B_token%5D=HC5M4nG-B-r5BUUSmCchkryqNQyu9RvDDlTvcTDuFFY&form%5Bq%5D=foobar
This is my Form
$data = array();
return $this->createFormBuilder($data)
->add('q', 'text')
->getForm();
And the current Controller
/**
* #var $form Form
*/
$form = $this->getSearchForm();
if ($request->isMethod('GET')) {
// contains q = 'foobar'
dump($_GET);
// null
dump($request->request->get('q'));
// null
dump($request->request->get('form'));
$form->submit($request->request->get($form->getName()));
$form->handleRequest($request);
$data = $form->getData();
// null
dump($data);
...
}
the form-template
{{ form_start(form, {'action': path('search'), 'method': 'GET', 'attr': { 'class' : 'navbar-form navbar-left', 'role' : 'search' }}) }}
{{ form_errors(form) }}
<div class="form-group">
{{ form_label(form.q) }}
{{ form_errors(form.q) }}
{{ form_widget(form.q, { 'attr': {'placeholder': 'Find' }}) }}
</div>
<button type="submit" class="btn btn-default">Find</button>
{{ form_end(form) }}

Answer 1

$request->request->all() is all of the $_POST parameters.
$request->query->all() is all of the $_GET parameters.
You should be using $request->query->get('q') or $request->get('a') (which will go through each of the parameter bags) to get your parameters.
For more info see the docs.