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 __init__(self, p1, p2):
        self.p1 = p1
        self.p2 = p2
        self.length = math.sqrt(math.pow((self.p2.x - self.p1.x), 2) + math.pow((self.p2.y - self.p1.y), 2))