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Building Scalable Backend Services in Go

MongoDB: Upsert

Explore how to use MongoDB's upsert functionality to conditionally update existing database records or insert new ones when no match is found. This lesson guides you through building and integrating an upsert feature within a Go backend service, enhancing your ability to manage dynamic data efficiently.

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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 ...