private function detachContentTypeGroupsByIdentifiers(ContentType $contentType, array $contentTypeGroupsIdentifiers)
    {
        $contentTypeGroups = $this->loadContentTypeGroupsByIdentifiers($contentTypeGroupsIdentifiers);
        foreach ($contentTypeGroups as $contentTypeGroup) {
            $this->contentTypeService->unassignContentTypeGroup($contentType, $contentTypeGroup);
        }
    }