[TYPO3-mvc] calling the findAll in another Action

[RAKIBI Anass]

Hello , 
I have created an extension with 2 Models Country and Company with a 1--* relation  . In the list view of the Country Controller , all the countries are listed (into a select ) , On a change event I want to list only Companies that belong to that Country using Ajax ...

The Ajax call is already designed and works fine , it calls an action in the Country controller , this action is designed to look for all companies where country_id = the id passed in the ajax call . here is how this action looks like : 

	public function getMyCompanysAction()
		{
			$argument     = $this->request->getArguments('id');
			$company      =  $this->entrepriseRepository->findBypays(2);// Repository of Company Model injected
			$company->att = 'val';
			$company->nom = $company->nom;
			$result       = (array) $company;
			return json_encode($result);
		} 

the $this->entrepriseRepository->findBypays(2);  seems to return always null here , though is returns the exact entry If I use it in ListAction 
this way : $this->view->assign('lists', $this->entrepriseRepository->findBypays(2));

What could be the Problem ? 
Best Regards