set selected values for entitytype - symfony

Question

I've have a formtype that has an entitytype field.
$builder->add('canRead', EntityType::class, [
'attr' => ['style' => 'height:150px;'],
'choice_value' => 'id',
'required' => true,
'multiple' => true,
'expanded' => false,
'class' => 'AppBundle\Entity\User',
'query_builder' => function (EntityRepository $er) {
$qb = $er->createQueryBuilder('e');
$qb->innerJoin('e.roles', 'r')->where('r.role LIKE :role')->setParameter('role', 'ROLE_ADMIN_%')
->orderBy('e.lastName', 'ASC')
->addOrderBy('e.firstGame', 'ASC');
return $qb;
},
]);
In the controller, I call this like that:
$form = $this->createForm(MedicalType::class, null, [ 'data'=>[] ]);
Where the 'data' is meant to be the selected values for the generated multiple select-field.
I've tried to pass a single User object, an array of User id's, arraycollection of Users, etc.. All of my tries before was the part from "query_builder"s results of course.
Did not work neither of them. Does someone know a solution to pass "selected" values for an entitytype field in formbuilder?
Thank you in advance.

Answer 1

The second parameter to createForm() being null seems to be the problem.
Lets say you have an array of user objects:
$data = [$user1, $user2];
Then try creating the form like that:
$form = $this->createForm(MedicalType::class, $data);
or this way:
$form = $this->createForm(MedicalType::class, array(), [ 'data'=> $data ]);

Answer 2

I tried the above solution but it didn't work for me so this might be helpful for someone else.
I had to pass an array of modules to the form so that it will be the default selected values, so in my controller i did this:
function testAction(){
$modules=array();
//here i'm just loading the modules that will be the default selected values
for ($i=7;$i<20;$i++){
$modules[]=$this->getDoctrine()->getRepository("AppBundle:Module")->find($i);
}
//passing the modules to the form
$form=$this->createForm(ModuleFieldType::class, array(), [ 'data'=> $modules ]);
return $this->render("/Security/test.html.twig",array("form"=>$form->createView()));
}
And in my form I did this :
$builder->add('module', EntityType::class, array(
'class' => 'AppBundle\Entity\Module',
'choice_label' => 'libelle',
'label' => 'Modules Enseignés',
'placeholder'=>"selectionez les modules enseigné",
'group_by' => function (Module $module) {
return $module->getDepartement()->getName();
},
"attr"=>array("id"=>"modulesSelect"),
'multiple' => true,
//you need add this to the form in order to read the data
'data'=>$options['data'],
));
The result was like that in the rendered form:
The rendered form