code/model/Blog.php
public function getCurrentTag() {
		$tag = $this->request->param("Tag");
		if($tag) {
			return $this->dataRecord->Tags()
				->filter("URLSegment", $tag)
				->first();
		}
		return null;
	}
public function getCurrentTag() {
		$tag = $this->request->param("Tag");
		if($tag) {
			return $this->dataRecord->Tags()
				->filter("URLSegment", $tag)
				->first();
		}
		return null;
	}
Tag Getter for use in templates.

@return BlogTag|null