[FLOW3-general] QueryInterface orderBy OneToMany property

[Robin Lehrmann]

Hello together.

I create a Query and set an ordering with an OneToMany property.
My two Models:

Customer:
protected $name;

@OEM\OneToMany(mappedBy="customer", cascade={"remove"})
protected $products;

Product:
protected $name;

@ORM\ManyToOne(inversedBy="products")
protected $customer;

Now I want to fetch all customers ordered by products ASC.
The customer with existing products first:

Customer A has 3 Products
Customer B has 1 Products
Customer C has 0 Products

my repository method:
$query = $this->createQuery();
return $query->setOrderings(array('products' => 
\TYPO3\Flow\Persistence\QueryInterface::ORDER_ASCENDING))->execute();

It returns NULL? Maybe I should ordered by the count of products? I dont 
know.

Please Help me!
Cheers, Robin.