private function createUserProviders($config, ContainerBuilder $container)
    {
        $providerIds = [];
        foreach ($config['providers'] as $name => $provider) {
            $id = $this->createUserDaoProvider($name, $provider, $container);
            $providerIds[str_replace('-', '_', $name)] = $id;
        }

        return $providerIds;
    }