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

    public function updatePolicyByRoleDraft($roleId, $policyId, Request $request)
    {
        $updateStruct = $this->inputDispatcher->parse(new Message(array('Content-Type' => $request->headers->get('Content-Type')), $request->getContent()));
        $role = $this->roleService->loadRoleDraft($roleId);
        foreach ($role->getPolicies() as $policy) {
            if ($policy->id == $policyId) {
                try {
                    return $this->roleService->updatePolicy($policy, $updateStruct);
                } catch (LimitationValidationException $e) {
                    throw new BadRequestException($e->getMessage());
                }
            }
        }
        throw new Exceptions\NotFoundException("Policy not found: '{$request->getPathInfo()}'.");
    }