Check if Object has relationship data

UsersController.php

<?php

class UsersController extends Controller
{
 
    public function deleteUser($id,Request $request)
    {
        try {
            $user = User::findOrFail($id);
            //only allowed delete user that have no evaluation
            if ($user->companies()->count()) {
                return response()->json(['result'=>'error', 'message'=>'not allowed to delete user with evaluation']);
            }
            else{
                $user->delete();
                return response()->json(['result'=>'success']);
            }
        }
        catch (QueryException $e) {
            return $this->response->errorBadRequest('Error while deleting.');
        }
    } 
  
  
  
}