def getall(self):
        try:
            spec = {'data': {'$exists': 1}}
            fields = {'_id': 0}
            sort = [('tid', 1)]
            cur = self.db.docs.find(spec, fields, sort=sort)
        except Exception as e:
            raise DatabaseException(e)
        return [Document(**row) for row in cur]
def _deDuplicate(results):
        found = dict()
        deDuped = list()
        for entry in results:
            dn = entry.get("dn")
            if not dn in found:
                found[dn] = 1
                deDuped.append(entry)

        return deDuped