How to render a choice field in a template - forms

Question

I use Symfony2 and twig as template engine.
In my controller I have the following form:
$usr= $this->get('security.context')->getToken()->getUser();
$associatedmissions = array($usr->getMissions());
$form = $this->createFormBuilder($product)
->add('mission', 'choice', array(
'choices' => $associatedmission,
'multiple' => false,
'expanded' => true, ))
But when I call the page, appears an error:
Catchable Fatal Error: Object of class Doctrine\ORM\PersistentCollection could not be
converted to string in
C:\BitNami\wampstack-5.4.23-
0\frameworks\symfony\vendor\symfony\symfony\src\Symfony\Component\Translation\
IdentityTranslator.php line 65
In the profiler I can see the error:
CRITICAL - Uncaught PHP Exception Twig_Error_Runtime: "An exception has been thrown
during the rendering of a template ("") in "form_div_layout.html.twig" at line 99." at
C:\BitNami\wampstack-5.4.23-0\frameworks\symfony\app\cache\dev\classes.php line 4372
Context: {"exception":"Object(Twig_Error_Runtime)"}
What happened?
It's strange because with it works properly
->add('mission', 'entity')
-UPDATE--
Here my controller:
public function createAction(Request $request)
{
$product = new Product();
$usr= $this->get('security.context')->getToken()->getUser();
$associatedmissions = array($usr->getMissions());
$form = $this->createFormBuilder($product)
->add('name', 'text')
->add('mission', 'choice', array(
'choices' => $associatedmissions,
'multiple' => false,
'expanded' => false, ))
->add('save', 'submit')
->getForm();
$form->handleRequest($request);
if ($form->isValid()) {
$em = $this->getDoctrine()->getManager();
$em->persist($product);
$em->flush();
return $this->render('AcmeGroundStationBundle:Product:tasksuccess.html.twig', array('product' => $product));
}
return $this->render('AcmeGroundStationBundle:Product:formupload.html.twig', array(
'form' => $form->createView()
));
}

Answer 1

aYou have this in your controller:
$usr= $this->get('security.context')->getToken()->getUser();
$associatedmissions = array($usr->getMissions());
$usr->getMissions() is returning ArrayCollection (based on relations in your Entity). This way $associatedmissions is an array with one element - [1] = ArrayCollection of related Mission Objects.
In my opinion you must add to your User entity method:
public function getMissionsArray()
{
$missionArray = array();
foreach ($this->missions as $key => $val)
{
$missionArray[$key] = $val->__toString();
}
return $missionArray;
}
And use array as choices param in your createFormBuilder statement.
When you validate your Form you have to create Mission object for every selection before persist product.
$this->getDoctrine()
->getRepository('AcmeGroundStationBundle:Mission')
->find($product->mission);
EDIT
// User Entity
// add this function - will return array of ( id => mission.name, )
public function getMissionsArray()
{
$missionArray = array();
foreach ($this->missions as $key => $val)
{
// change this to whatever human readable getter
$missionArray[$key] = $val->__toString();
}
return $missionArray;
}
// Controller
public function createAction(Request $request)
{
$product = new Product();
$usr= $this->get('security.context')->getToken()->getUser();
$associatedmissions = $usr->getMissionsArray();
$form = $this->createFormBuilder($product)
->add('name', 'text')
->add('mission', 'choice', array(
'choices' => $associatedmissions,
'multiple' => false,
'expanded' => false, ))
->add('save', 'submit')
->getForm();
$form->handleRequest($request);
if ($form->isValid()) {
// save selected array item as a Mission object related to Product
$product->setMission($this->getDoctrine()
// check if Mission Entity is placed in good bundle ;)
->getRepository('AcmeGroundStationBundle:Mission')
->find($form->get('mission')->getData()));
$em = $this->getDoctrine()->getManager();
$em->persist($product);
$em->flush();
return $this->render('AcmeGroundStationBundle:Product:tasksuccess.html.twig', array('product' => $product));
}
return $this->render('AcmeGroundStationBundle:Product:formupload.html.twig', array(
'form' => $form->createView()
));
}
Good Luck!

Answer 2

Try to use redirect. Is it work?
if ($form->isValid()) {
$em = $this->getDoctrine()->getManager();
$em->persist($product);
$em->flush();
return $this->redirect($this->generatePath('current_route_name'));
}
return $this->render('AcmeGroundStationBundle:Product:formupload.html.twig', array(
'form' => $form->createView()
));
Where current_route_name is replace by your route name of current page.