How do I update a Mongo document after inserting it?

Question

Let\'s say I insert the document.

post = { some dictionary }
mongo_id = mycollection.insert(post)

Now, let\'s say I want to add a field and

Answer 1

mycollection.find_one_and_update({"_id": mongo_id}, 
                                 {"$set": {"newfield": "abc"}})

should work splendidly for you. If there is no document of id mongo_id, it will fail, unless you also use upsert=True. This returns the old document by default. To get the new one, pass return_document=ReturnDocument.AFTER. All parameters are described in the API.

The method was introduced for MongoDB 3.0. It was extended for 3.2, 3.4, and 3.6.