cakephp3 index method pagnate by users role

gistfile1.txt

public function index(){
        
		$user_id=$this->Auth->user('id');
		$role=$this->Auth->user('role');
		
		//check users role and show all questions if admin or just their questions of normal user
		
		if($role=='admin'){
			//show all questions
			$this->paginate = [
				'limit' =>20,
				'order' => ['Questions.modified' => 'desc'],
				'contain' => ['Users', 'Questionscategories']
			];
		}
		elseif($role=='user'){
			//show only the users stuff
			//set the pagnate options
			$this->paginate = [
				'limit' =>10,
				'order' => ['Questions.modified' => 'desc'],
				'contain' => ['Users', 'Questionscategories'],
				'conditions'=>['questions.user_id'=>$user_id]
			];
		}		
		
		$questions = $this->paginate($this->Questions);

    $this->set(compact('questions'));
    $this->set('_serialize', ['questions']);
        
 }