Upsert

The Upsert method is used to update a single document in a collection based on a filter and insert the document if it does not exist.

Usage

result := WitcherModel.UpdateOne(primitive.M{"name": "Vesemir"}, primitive.M{"age": 200}).Upsert().Exec().(*mongo.UpdateResult)

The example above finds a single witcher with the name "Vesemir" and updates their age to 200. If the document does not exist, it will be inserted into the collection.

Usage with Options

You can pass the Upsert field as true in the UpdateOptions to specify that the operation should perform an upsert.

opts := options.UpdateOptions{}
opts.SetUpsert(true)
result := WitcherModel.UpdateOne(primitive.M{"name": "Vesemir"}, primitive.M{"age": 200}, &opts).Exec().(*mongo.UpdateResult)

In the example above, we are passing options to the FindByIDAndUpdate method to return the document after the update operation has been performed.