[TYPO3-mvc] Findby* returns the exact number of objects but null

[RAKIBI Anass]

Hey , 

my findbypay ( pay beeing here as a parameter) returns the exact number of entries in the database but the objects are null ...

here is how I use it in an action : 

	public function getMyCompanysAction()
		{
			$argument  = $this->request->getArguments('id');
			$companies =  $this->entrepriseRepository->findBypay(2)->toArray(); // just to test with the id 2
			return json_encode($companies);
		}
the outputed json array contains 3 braces but is empty .. [{},{},{}]. 

how could this really happen ? knowing that when I use the same method and assign it to the view , the objects are complete and 
I mean this way : 

public function listAction()
		{

			
			$this->view->assign('lists', $this->entrepriseRepository->findBypays(2));
		}