def get(cls, ns, key):
        """Fetch an item by namespace and key

        Args:
            ns (str): Namespace prefix
            key (str): Item key

        Returns:
            :obj:`Configitem`: Returns config item object if found, else `None`
        """
        return getattr(db, cls.__name__).find_one(
            ConfigItem.namespace_prefix == ns,
            ConfigItem.key == key
        )
Fetch an item by namespace and key

        Args:
            ns (str): Namespace prefix
            key (str): Item key

        Returns:
            :obj:`Configitem`: Returns config item object if found, else `None`