Symfony 3.3 CraueFormFlowBundle Request_stack is empty - symfony-3.3

Question

my first question to this site is a little difficult to describe.
I am quite new to Symfony, startet with 3.2 and updated recently to 3.3.5 (not sure if relevant for the problem).
I tried to use CraueFormFlowBundle (multistep form bundle) but cannot get it to work.
The problem is that trying to access the flow results in an exception:
Error: Call to a member function getCurrentRequest() on null
Symfony\Component\Debug\Exception\ FatalErrorException
in vendor/craue/formflow-bundle/Form/FormFlow.php (line 191)
Line 191 shows: $currentRequest = $this->requestStack->getCurrentRequest();
Modifying the FormFlow.php with dump line shows that $this->requestStack is null.
I have not enough knowledge about this bundle to know where to start looking for the problem.
The flow definition is based on the location example:
namespace EngineeringBundle\Form;
use Craue\FormFlowBundle\Form\FormFlow;
use Craue\FormFlowBundle\Form\FormFlowInterface;
class SelectExaminationFlow extends FormFlow
{
/**
* {#inheritDoc}
*/
protected function loadStepsConfig()
{
dump("loadStepsConfig");
return array(
array(
'label' => 'engineering.discipline',
'form_type' => new SelectExaminationStep1Form(),
),
array(
'label' => 'engineering.date',
'form_type' => new SelectExaminationStep2Form(),
'skip' => function($estimatedCurrentStepNumber, FormFlowInterface $flow) {
return $estimatedCurrentStepNumber > 1 && !$flow->getFormData()->canHaveRegion();
},
),
array(
'label' => 'confirmation',
),
);
}
The form definition is also quite simple and works without problems:
class SelectExaminationStep1Form extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
dump("buildForm");
$builder
->add('id', HiddenType::class)
->add('discipline', EntityType::class, array(
'class' => 'EngineeringBundle:Discipline',
'choice_label' => 'disciplineName',
'label' => 'engineering.discipline.label'
)
);
}
public function getName() {
return $this->getBlockPrefix();
}
public function getBlockPrefix() {
return 'createEngineeringStep1';
}
}
services.yml:
EngineeringBundle\Form\SelectExaminationFlow:
parent: craue.form.flow
autowire: false
autoconfigure: false
public: true
engineering.form_flow:
alias: EngineeringBundle\Form\SelectExaminationFlow
public: true
Controller:
/**
* #Route("create", name="engineering_create")
*/
public function createAction()
{
return $this->processFlow(new ExaminationDate(), $this->get('engineering.form_flow'));
}
Thanks in advance
Sebastian

Answer 1

I was having the same problem, resolved it by adding a constructor to vendor/craue/formflow-bundle/Form/FormFlow.php with the following content:
public function __construct(RequestStack $requestStack, FormFactoryInterface $formFactory, DataManagerInterface $dataManager, EventDispatcherInterface $eventDispatcher) {
$this->formFactory = $formFactory;
$this->requestStack = $requestStack;
$this->dataManager = $dataManager;
$this->eventDispatcher = $eventDispatcher;
}
Make sure to place it after all setter-methods. Problem seems to be related to a symfony update.