public function revokeRole($id)
 {
     $message = 'You are not allowed to change the roles!';
     if ($this->shouldLockIfNoPermission('members.edit', '/members/view/' . $id, $message)) {
         return;
     }
     if ($this->request->is('post')) {
         $accountService = new Account($this->db);
         $role = $_POST['role'];
         if (strlen($role) > 0) {
             $roleService = new Role($this->db);
             $username = $accountService->getUsernameOfId($id);
             if ($roleService->revokeRoleFromAccount($username, $role)) {
                 $this->flash->success('Deleted role successfully!');
             } else {
                 $this->flash->addMany($roleService->getAllMessages(), 'warning');
             }
         } else {
             $this->flash->warning('You must type in a role!');
         }
     }
     return $this->redirect('/members/view/' . $id);
 }