How to get the object id in PyMongo after an insert?

mongodb insert pymongo
user1125472 picture user1125472 · Jan 9, 2012 · Viewed 42.9k times · Source

I'm doing a simple insert into Mongo...

db.notes.insert({ title: "title", details: "note details"})

After the note document is inserted, I need to get the object id immediately. The result that comes back from the insert has some basic info regarding connection and errors, but no document and field info.

I found some info about using the update() function with upsert=true, I'm just not sure if that's the right way to go, I have not yet tried it.

Answer

Tyler Brock picture Tyler Brock · Jan 9, 2012

One of the cool things about MongoDB is that the ids are generated client side.

This means you don't even have to ask the server what the id was, because you told it what to save in the first place. Using pymongo the return value of an insert will be the object id. Check it out:

>>> import pymongo
>>> collection = pymongo.Connection()['test']['tyler']
>>> _id = collection.insert({"name": "tyler"})
>>> print _id
4f0b2f55096f7622f6000000

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