ModelBundle/Form/DataTransformer/EmbedSiteToSiteTransformer.php
public function reverseTransform($value)
    {
        $sites = array();

        foreach ($value as $site) {
            $sites[] = array('siteId' => $site->getSiteId());
        }

        return $sites;
    }
public function reverseTransform($value)
    {
        $sites = array();

        foreach ($value as $site) {
            $sites[] = array('siteId' => $site->getSiteId());
        }

        return $sites;
    }
@param SiteInterface $value

@return string

@throws TransformationFailedException When the transformation fails.