Unable to pass a specific form in the view - forms

Question

I have created a CRUD with Symfony 3 that allows me to create different missions with a few specificities. I want to to create a function that allows someone with a specific role to change a mission's status just by clicking a button, that would be shown in the view like this
{{form_start(missionInProgress) }}
<input type="submit" value="Submit" />
{{form_end(missionInProgress) }}
Since I'm a real newbie and I can't find concrete example on Google, I tried a lot of things, but none worked so far. I tried to create a public function that would modify the mission's status when someone clicks on the input button
public function that updates the mission's status:
/**
* #Route("/{id}/encours", name="mission_encours")
* #Security has_role('ROLE_RECRUTEUR')
* #Method("POST")
*/
public function enCoursAction(Request $request, Mission $mission){
$form = $this->missionInProgress($mission);
$form->handleRequest($request);
if($form->isSubmitted() && $form->isValid()){
$em = $this->getDoctrine()->getManager();
$mission->setStatut("En cours");
$em->persist($mission);
}
}
And I also tried to create a private function like the one that allows a mission to be deleted from anywhere.
**Private function that calls the public function: **
/**
* #param Mission $mission
* #Security has_role('ROLE_RECRUTEUR')
* #return \Symfony\Component\Form\Form The form
*/
private function missionInProgress(Mission $mission){
$this->createFormBuilder()
->setAction($this->generateUrl('mission_encours', array('id' => $mission->getId())))
->setMethod('POST')
->getForm();
}
Following the "createDeleteForm" example, I implemented it in the showAction as follow:
/**
* Finds and displays a Mission entity.
*
* #Route("/{id}", name="mission_show")
* #Method("GET")
*/
public function showAction(Mission $mission)
{
$deleteForm = $this->createDeleteForm($mission);
$enCours = $this->missionInProgress($mission); /* There */
return $this->render('mission/show.html.twig', array(
'mission' => $mission,
'delete_form' => $deleteForm->createView(),
'missionInProgress' => $enCours->createView(), /* And there */
));
}
But when I try to see the result, I get the following error:
Error: Call to a member function createView() on null
Obviously nothing gets inside missionInProgress(), but I can't figure why and how to make this damn thing work. I also don't think that everything I did was necessary, but I thought that if I do this, I might increase my success chances...
Anyone has an idea ?
Thank you in advance

Answer 1

Try to add returnin your missionInProgress() method