def get_next_id(self):
        try:
            query = {'_id': 'last_id'}
            update = {'$inc': {'id': 1}}
            fn = self.db.internal.find_and_modify
            row = fn(query, update, upsert=True, new=True)
        except Exception as e:
            raise DatabaseException(e)
        return row['id']
def _get_markup_for_tags(self, tag_names):
        """Given a list of tags names, generates the pango markup to render
         that list with the tag colors used in GTG

        @param tag_names: the list of the tags (strings)
        @return str: the pango markup string
        """
        if ALLTASKS_TAG in tag_names:
            tags_txt = ""
        else:
            tags_txt = get_colored_tags_markup(self.req, tag_names)
        return "<small>" + tags_txt + "</small>"