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

Question

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 1

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.inserted_id 
4f0b2f55096f7622f6000000

Answer 2

The answer from Tyler does not work for me.

Using inserted_id works

>>> import pymongo
>>> collection = pymongo.Connection()['test']['tyler']
>>> db_result = collection.insert({"name": "tyler"})
>>> print(db_result)
<pymongo.results.InsertOneResult object at 0x0A7EABCD>
>>> print(db_result.inserted_id)
5acf02400000000968ba447f

Answer 3

It's better to use insert_one() or insert_many() instead of insert(). Those two are for the newer version. You can use inserted_id to get the id.

myclient = pymongo.MongoClient("mongodb://localhost:27017/")
myDB = myclient["myDB"]
userTable = myDB["Users"]
userDict={"name": "tyler"}

_id = userTable.insert_one(userDict).inserted_id
print(_id)

Or

result = userTable.insert_one(userDict)
print(result.inserted_id)
print(result.acknowledged)

If you need to use insert(), you should write like the lines below

_id = userTable.insert(userDict)
print(_id)

Answer 4

Newer PyMongo versions depreciate insert, and instead insert_one or insert_many should be used. These functions return a pymongo.results.InsertOneResult or pymongo.results.InsertManyResult object.

With these objects you can use the .inserted_id and .inserted_ids properties respectively to get the inserted object ids.

Find out more about insert_one, insert_many, and pymongo.results.InsertOneResult at the pymongo docs.

Answer 5

updated; removed previous because it wasn't correct

It looks like you can also do it with db.notes.save(...), which returns the _id after it performs the insert.

See for more info: http://api.mongodb.org/python/current/api/pymongo/collection.html

Answer 6

some_var = db.notes.insert({ title: "title", details: "note details"})
print(some_var.inserted_id)

Answer 7

You just need to assigne it to some variable:

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

Answer 8

To get the ID after an Insert in Python, just do like this:

doc = db.notes.insert({ title: "title", details: "note details"})
return str(doc.inserted_id) # This is to convert the ObjectID (type of doc.inserted_id into string)