Symfony4 - Undefined index: on entity join - symfony

Question

I'm getting an
undefined index: order
error even though from what I can tell using this documentation I'm doing everything right. Any ideas?
OrdersRepository
public function findByDateAndEmployee(\DateTime $date, int $employeeId)
{
return $this->createQueryBuilder('o')
->select('o')
->join('o.employees' ,'e')
->where('e.id = :id')
->setParameter('id',$employeeId)
->getQuery()->getSql();
}
Orders Entity
class Orders
{
...
/**
* One Order has Many Employees.
* #ORM\OneToMany(targetEntity="Employee", mappedBy="order", cascade={"persist", "remove"}, orphanRemoval=TRUE)
*/
private $employees;
I know if I change the variable in "mappedBy" it will change the error message to whatever the variable name is, however when you see below "order" should be the mappedBy variable (at least, I think).
OrderEmployees Entity
class OrderEmployees
{
/**
* #ORM\Id()
* #ORM\GeneratedValue()
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\Column(type="integer")
*/
private $orderId;
/**
* #ORM\Column(type="smallint")
*/
private $employeeId;
/**
* #ORM\ManyToOne(targetEntity="Orders", inversedBy="employees")
* #ORM\JoinColumn(name="order_id", referencedColumnName="id")
*/
private $order;
public function getId(): ?int
{
return $this->id;
}
public function getOrderId(): ?int
{
return $this->orderId;
}
public function setOrderId(int $orderId): self
{
$this->orderId = $orderId;
return $this;
}
public function getEmployeeId(): ?int
{
return $this->employeeId;
}
public function setEmployeeId(int $employeeId): self
{
$this->employeeId = $employeeId;
return $this;
}
public function getOrder(): Orders
{
return $this->order;
}
public function setOrder(Orders $order): self
{
$this->order = $order;
return $this;
}
}

Answer 1

Changing targetEntity="Employee" to targetEntity="OrderEmployees" in your Orders entity should help.
From the docs:
targetEntity: FQCN of the referenced target entity. Can be the
unqualified class name if both classes are in the same namespace.