def insert(self, doc, synced=False):
        doc.id = self.get_next_id()
        doc.synced = synced
        try:
            self.db.docs.insert(doc)
        except Exception as e:
            raise DatabaseException(e)
        return doc
def getLenp1(self):
        p2 = self.p2
        ret = p2.distance(self.p3)
        return ret