MongoDB Go Driver CRUD Operations

In this tutorial, you'll learn about MongoDB Go Driver CRUD Operations. We cover key concepts, practical examples, and best practices.

MongoDB CRUD -- Perform Create, Read, Update, Delete with the MongoDB Go driver using Collection methods.

The Problem

MongoDB methods return result types. Ignoring results or not checking errors leads to silent failures. Always check InsertedID and errors.

Wrong

collection := client.Database("test").Collection("users")
collection.InsertOne(ctx, bson.M{"name": "Alice"})

Output:

// No error check. Insert may have failed silently.

Right

result, err := collection.InsertOne(ctx, bson.M{"name": "Alice"})
if err != nil { log.Fatal(err) }
fmt.Println("Inserted ID:", result.InsertedID)

Output:

Inserted ID: ObjectID("665...")

Prevention

• Always check errors from Collection methods
• Use InsertOne, FindOne, UpdateOne, DeleteOne
• Use bson.M for maps or bson.D for ordered documents
• Use Find with cursor iteration
• Use ReplaceOne for full document replacement

Common Mistakes with mongodb crud

1. Using foldl instead of foldl' causing stack overflow on large lists
2. Forgetting deriving (Show, Eq) on custom data types needed for debugging
3. Placing the wildcard pattern first in case expressions, making all subsequent patterns unreachable

These mistakes appear frequently in real-world GO code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ

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