Building Scalable Backend Services in Go/

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MongoDB: Upsert

MongoDB: Upsert

Learn how to update an existing document or create it if missing.

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The Upsert method verifies the presence of a resource with a matching identifier. In case of a match, an Update method is executed; whereas if no match is found, it proceeds with a Create action. Let us take a look at how we would build similar functionality in our MongoDB package.

The Update method in MongoDB

Go (1.18.2)


func (mongodb *Mongo) Update(query *db.Query) error {

	collection := mongodb.Client.

		Database(query.Database).

		Collection(query.Collection)

	context, cancel := context.WithTimeout(context.Background(), TIMEOUT)

	defer cancel()

	_, err := collection.UpdateOne(

		context,

		query.Filter,

		bson.D{{

			Key:   "$set",

			Value: query.Object,

		}},

		options.Update().SetUpsert(true),

	)

	return err

}

Most of this function looks almost identical to our ...