public function unassignRoleFromUser($userId, $roleId)
    {
        $user = $this->userService->loadUser($userId);
        $role = $this->roleService->loadRole($roleId);

        $this->roleService->unassignRoleFromUser($role, $user);

        $roleAssignments = $this->roleService->getRoleAssignmentsForUser($user);

        return new Values\RoleAssignmentList($roleAssignments, $user->id);
    }