public function getRules($commentableType)
	{
		$commentableObj = new $commentableType;
		$table = $commentableObj->getTable();
		$key = $commentableObj->getKeyName();
		$rules = array(
			'commentable_type' => 'required|in:'.implode(',', Config::get('laravel-comments::commentables')),
			'commentable_id' => 'required|exists:'.$table.','.$key,
			'comment' => 'required',
		);
		return $rules;
	}