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

@return BlogCategory|null