eZ\Publish\Core\REST\Server\Controller\Role::updateRoleDraft PHP Method

    public function updateRoleDraft($roleId, Request $request)
    {
        $createStruct = $this->inputDispatcher->parse(new Message(array('Content-Type' => $request->headers->get('Content-Type')), $request->getContent()));
        try {
            // First try to load the draft for given role.
            $roleDraft = $this->roleService->loadRoleDraftByRoleId($roleId);
        } catch (NotFoundException $e) {
            // We might want a newly created role, so try to load it by its ID.
            // loadRoleDraft() might throw a NotFoundException (wrong $roleId). If so, let it bubble up.
            $roleDraft = $this->roleService->loadRoleDraft($roleId);
        }
        return $this->roleService->updateRoleDraft($roleDraft, $this->mapToUpdateStruct($createStruct));
    }