python - Why does upsert a record using update_one raise ValueError? -

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i want add record collection if key doesn't exist. understand [mongodb][1] offers upsertfor did 

db.collection.update({"_id":"key1"},{"_id":"key1"},true)

this seems work.

however in pymongo documentation says update deprecated , use update_one().

but:

db.collection.update_one({"_id":"key1"},{"_id":"key1"},true)

gives:

raise valueerror('update works $ operators') valueerror: update works $ operators

i don't understand why update_one different , why need use $ operator. can help?

this because didn't specify update operator. example $set id value use:

db.collection.update_one({"_id":"key1"}, {"$set": {"id":"key1"}}, upsert=true)

note in mongo shell, replace document new document.


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