How to delete the last item of a collection in mongodb

问题

I made a program with python and mongodb to do some diaries. Like this

Sometimes I want to delete the last sentence, just by typing "delete!" But I dont know how to delete in a samrt way. I dont want to use "skip". Is there a good way to do it?

回答1:

Be it first or last item, MongoDB maintains unique _id key for each record and thus you can just pass that id field in your delete query either using deleteOne() or deleteMany(). Since only one record to delete you need to use deleteOne() like

db.collection_name.deleteOne({"_id": "1234"}) // replace 1234 with actual id

来源：https://stackoverflow.com/questions/39030332/how-to-delete-the-last-item-of-a-collection-in-mongodb