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 remove_duplicates(self):
        if self.ui.chkBRemoveDuplicates.isChecked():
            for lbl in self.message.message_type:
                seq = lbl.fuzz_values[:]
                seen = set()
                add_seen = seen.add
                lbl.fuzz_values = [l for l in seq if not (l in seen or add_seen(l))]