public function addTag(Models\Image $image, Models\Tag $tag, Models\User $user = null)
{
$imageTagLink = new Models\ImageTagLink();
$imageTagLink->file_id = $image->file_id;
$imageTagLink->tag_id = $tag->tag_id;
if ($user) {
$imageTagLink->created_user = $user->user_id;
}
$imageTagLink->save();
$tag->updatePopularityCount();
return $imageTagLink;
}
