How to query for objectid on mongodb using python

Question

I am trying to print all the object ids in a collection I have in mongoDB. I understand how to convert the ObjectId to a string, however I am not sure how to actually make a call to list all the object ids.

I tried the following from pymongo documentation but nothing happens because I have 4 ObjectIds

def get(post_id):
    Document=client.db.collection.find_one({'_id':ObjectId(post_id)})
    return Document

Hi joseph; can you explain what you mean when you say you have four ObjectIds, and how this makes the database query go wrong? — Vince Bowdren
– Vince Bowdren, Commented Mar 31, 2017 at 16:23
In my mongodb, I have a collection. Under that collection, there are four different objectIDs. I want to be able to return all 4 different object ids because afterwards i have a function that updates the database data but the data that needs to be updated depends on the object id. For example data X must be updated to object id X, data y to object id y, etc — joseph wallberg
– joseph wallberg, Commented Mar 31, 2017 at 17:52
Running the above code returns nothing. I want it to return the 4 unique object ids — joseph wallberg
– joseph wallberg, Commented Mar 31, 2017 at 17:53

Ruoding Tian · Accepted Answer · 2021-04-23 23:24:32Z

3

from bson import ObjectId

id = "5fec2c0b348df9f22156cc07"
objInstance = ObjectId(id)
  
collection.find_one({"_id": objInstance})
  
# below line works same as the above
collection.find_one({"_id": ObjectId(id)})
collection.find_one(ObjectId(id))

bson should already been installed once you installed pymongo

answered Apr 23, 2021 at 23:24

Ruoding Tian

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