Tutorials on upserts in mongodb

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An upsert is like an update, but will do an insert if record was not found.  Continuing from our last example, we made changes to the following …



Since our collection does have “state” of “New State”, the query found a document and replaced it with the new “doc”.  But if it did not, it would have inserted the new “doc”.  In either case, it would have return 1 as num_updated.