By default, the db.collection.update() method updates a single document. ... If both upsert and multi are true and no documents match the query, the update operation ... Before MongoDB 4.2, a document's shard key field value is immutable.
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mongoose-upsert-default-values
Alive; // persist it: if you keep the default ObjectId ID field, it will be populated by ... the database, it uses the upsert capability of MongoDB to do it in a single query. ... To do so, you need to provide default values for all the fields of your classes.. As MongoDB Github collection documented with respect to Node.js ... lastErrorObject.n); test.equal(1, r.value.b); test.equal(1, r.value.d); db.close(); }); }); }); ... upsert: bool - creates the object if it doesn't exist. defaults to false. 939c2ea5af