eZ\Publish\Core\REST\Server\Controller\User::unassignUserFromUserGroup PHP Method

    public function unassignUserFromUserGroup($userId, $groupPath)
    {
        $user = $this->userService->loadUser($userId);
        $userGroupLocation = $this->locationService->loadLocation(trim($groupPath, '/'));
        $userGroup = $this->userService->loadUserGroup($userGroupLocation->contentId);
        try {
            $this->userService->unAssignUserFromUserGroup($user, $userGroup);
        } catch (ApiExceptions\InvalidArgumentException $e) {
            // User is not in the group
            throw new Exceptions\ForbiddenException($e->getMessage());
        }
        $userGroups = $this->userService->loadUserGroupsOfUser($user);
        $restUserGroups = array();
        foreach ($userGroups as $userGroup) {
            $userGroupContentInfo = $userGroup->getVersionInfo()->getContentInfo();
            $userGroupLocation = $this->locationService->loadLocation($userGroupContentInfo->mainLocationId);
            $contentType = $this->contentTypeService->loadContentType($userGroupContentInfo->contentTypeId);
            $restUserGroups[] = new Values\RestUserGroup($userGroup, $contentType, $userGroupContentInfo, $userGroupLocation, $this->contentService->loadRelations($userGroup->getVersionInfo()));
        }
        return new Values\UserGroupRefList($restUserGroups, $this->router->generate('ezpublish_rest_loadUserGroupsOfUser', array('userId' => $userId)), $userId);
    }