/**
* Return the relation ID for the given blog ID and term taxonomy ID.
*
* @param int $site_id Blog ID.
* @param int $term_taxonomy_id Term taxonomy ID.
*
* @return string
*/
public function get_relation_id($site_id, $term_taxonomy_id)
{
$translation_ids = $this->content_relations->get_existing_translation_ids($site_id, 0, $term_taxonomy_id, 0, 'term');
if (!$translation_ids) {
return '';
}
$relation = reset($translation_ids);
return $relation['ml_source_blogid'] . '-' . $relation['ml_source_elementid'];
}