Upsert Documents in MongoDB Collections using updateOne and replaceOne

In this lesson, we learn that upserting in MongoDB allows us to update a document if it exists or insert a new one if it does not.

We demonstrate how to use the updateOne method with the upsert flag set to true, which enables us to create a new document for "Kill Bill" with specified skills and age when no matching document is found.

Additionally, we explore using replaceOne for similar functionality, confirming that a new document is created when attempting to replace one that does not exist.

This operation simplifies database interactions by combining update and insert actions into a single command.