如何为在 Azure 中运行的 MongoDB 中的每个 db.collection.insert_one(doc) 创建一个唯一的`_id`？

Question

class MongoABC:
    def __init__(self):
    # all the variable initialisation    
    ...

    def insert_to_mongo(self, user_id, json):
        self.db.collection.insert_one(json)

If I create an instance of MongoABC and call the insert_to_mongo function more than once, it generates a E11000 duplicate key error on the _id .

It performs it in real time so previous solutions of making a copy of inserting document( json ), upserting it or deleting the _id as suggested here doesn't seem to work in this case. The _id always remain constant as long as the MongoABC instance is same. So how do we create an unique _id for every time we call insert_one() ?

This error is specific to mongo servers running in Microsoft azure.

Answer 1

You don't need to create id for mongo db. Once document is inserted, id is automatically generated. You can check id by this snippet.

obj = db[collection].insert_many(json)
print(obj.inserted_ids)