public static function queryByParentType( $parentType, $config = [] ) {

		$type	= isset( $config[ 'type' ] ) ? $config[ 'type' ] : self::TYPE_COMMENT;
		$status	= isset( $config[ 'status' ] ) ? $config[ 'status' ] : self::STATUS_APPROVED;

		return self::find()->where( [ 'parentType' => $parentType, 'type' => $type, 'status' => $status ] );
	}