Symfony 4 - EntityType - Load current value - symfony

Question

I am using an EntityType in a formType in Symfony 4. When I am displayed it in a new form all works great, the choicetype liste contain all the values from my database. But when I load existing data from my database the choice list don't load the value from the database, it display the placeholer. I have checked in the database and the value is saved. My form looks like this
->add('operatingSystem', EntityType::class, [
'class' => "App\Entity\TicketOperatingSystem",
'choice_label' => 'name',
'label' => 'Système d\'exploitation',
'required' => false,
])
The entity :
/**
* #ORM\ManyToOne(targetEntity="Maps_red\TicketingBundle\Entity\TicketOperatingSystem")
* #ORM\JoinColumn(name="operating_system", referencedColumnName="id", nullable=true)
*/
private $operatingSystem;
public function getOperatingSystem(): ?TicketOperatingSystemInterface
{
return $this->operatingSystem;
}
public function setOperatingSystem(?TicketOperatingSystemInterface $ticketOperatingSystem): UserInstance
{
$this->operatingSystem = $ticketOperatingSystem;
return $this;
}
OperatingSystem Entity :
/**
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
private $id;
/**
* #ORM\Column(type="string", length=255)
*/
private $name;
public function getId() : ?int
{
return $this->id;
}
public function getName(): ?string
{
return $this->name;
}
public function setName(string $name): TicketOperatingSystemInterface
{
$this->name = $name;
return $this;
}
For testing I try to change the EntityType to a ChoiceType with a list of 2, it works perfectly. I don't know what the problem with EntityType is.

Answer 1

Try adding 'choice_value' => 'name',
->add('operatingSystem', EntityType::class, [
'class' => "App\Entity\TicketOperatingSystem",
'choice_label' => 'name',
'choice_value' => 'name',
'label' => 'Système d\'exploitation',
'required' => false,
])