Showing name and saving id in symfony dropdown - symfony

Question

I want to show the 'name' of my departments as a dropdown to my users and when they choose one, save its 'id' into the database. How can i do that? Below is my code. Currentlt its showing id and saving id.
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('name')
->add('adress')
->add('city')
->add('area')
->add('departments', 'entity', array(
'empty_value' => '',
'class' => 'YdyaHospitalBundle:Department',
'query_builder' => function($repository) { return $repository->createQueryBuilder('t')->orderBy('t.id', 'ASC'); },
'property' => 'id',
'multiple' =>false,
'expanded' =>true,
))
;
}
Update
My controller action:
/**
* Creates a new Hospitals entity.
*
* #Route("/", name="hospitals_create")
* #Method("POST")
* #Template("YdyaHospitalBundle:Hospitals:new.html.twig")
*/
public function createAction(Request $request)
{
$entity = new Hospitals();
$form = $this->createForm(new HospitalsType(), $entity);
$form->bind($request);
if ($form->isValid()) {
$em = $this->getDoctrine()->getManager();
$em->persist($entity);
$em->flush();
return $this->redirect($this->generateUrl('hospitals_show', array('id' => $entity->getId())));
}
return array(
'entity' => $entity,
'form' => $form->createView(),
);
}
/**
* Displays a form to create a new Hospitals entity.
*
* #Route("/new", name="hospitals_new")
* #Method("GET")
* #Template()
*/
public function newAction()
{
$entity = new Hospitals();
$form = $this->createForm(new HospitalsType(), $entity);
return array(
'entity' => $entity,
'form' => $form->createView(),
);
}

Answer 1

You can either implement a __toString() for your entity, or specify the property to display with:
->add('departments', 'entity', array(
'empty_value' => '',
'class' => 'YdyaHospitalBundle:Department',
'query_builder' => function($repository) { return $repository->createQueryBuilder('t')->orderBy('t.id', 'ASC'); },
// 'property' => 'id', --> Remove this
'multiple' => false,
'expanded' => true,
'property' => 'name' // Property used to display the entity
))
In your Controller you'll still be able to save your entity or the id of your entity to the db.
See documentation: http://symfony.com/doc/current/reference/forms/types/entity.html#property