public static function addTags($tags)
{
$res = Tag::findAll(['name' => $tags]);
foreach ($res as $tag) {
$tag->updateCounters(['frequency' => 1]);
}
foreach ($tags as $name) {
if (!Tag::findOne(['name' => $name])) {
$tag = new Tag();
$tag->name = $name;
$tag->frequency = 1;
$tag->save();
}
}
}