public function getAllTags($class)
{
if ($class instanceof Model) {
$class = get_class($class);
}
$sql = 'SELECT DISTINCT t.*' . ' FROM taggable_taggables tt LEFT JOIN taggable_tags t ON tt.tag_id=t.tag_id' . ' WHERE tt.taggable_type = ?';
return Tag::hydrateRaw($sql, [$class]);
}