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Building Scalable Backend Services in Go

MongoDB: Read

Explore how to read user documents from MongoDB in Go by implementing a flexible Get function that deserializes data into structs. Learn to handle query parameters and build an API endpoint to retrieve database records efficiently.

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Now that we are capable of writing documents to MongoDB, let us take a look at how we can read them. As always, we must first implement our MongoDB package method for the same.

MongoDB’s read method

Go (1.18.2)
func (mongodb *Mongo) Get(query *db.Query, target interface{}) error {

	collection := mongodb.Client.

		Database(query.Database).

		Collection(string(query.Collection))

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

	result := collection.FindOne(context, query.Filter)

	defer cancel()

	err := result.Decode(target)

	return err

}

The Get function is primarily directed by the query being passed to the function. The method itself only calls the underlying library’s FindOne method in line 6. Now, there is a slight catch here. The ...