Project Review

This is a well-structured Go skeleton project that follows Clean Architecture principles. Coming from Rails, you'll find some familiar patterns but with Go's unique approach.

Architecture Highlights:

Strong Points:

• ✅ Clean separation of concerns (Handler → Usecase → Repository)
• ✅ Dependency injection pattern (similar to Rails services)
• ✅ JWT authentication with RS512 (like Devise but more explicit)
• ✅ Database migrations (like Rails migrations)
• ✅ Unit testing with mocks (like RSpec with doubles)
• ✅ API documentation with Swagger
• ✅ Background jobs via RabbitMQ (like Sidekiq)
• ✅ Proper error handling and logging

Rails vs Go Comparison:

• Handlers = Rails Controllers
• Usecases = Rails Service Objects/Interactors
• Repositories = Rails ActiveRecord Models (but more explicit)
• Entities = Rails Models (just data structures, no ORM magic)
• Fiber = Rails/Sinatra (fast HTTP framework)

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Suggested Learning Use Cases

Based on your Rails background, here are practical scenarios ranked by learning value:

1. Blog API with Comments 🌟 Best for Beginners

Why: Extends existing patterns, teaches Go relationships

What to build:

• Posts CRUD (title, body, author)
• Comments (belongs to posts)
• Categories/Tags (many-to-many)
• Markdown support for posts

What you'll learn:

• Go struct composition
• GORM associations (has_many, belongs_to)
• Nested JSON responses
• Filtering and pagination

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2. E-commerce Product Catalog 🌟 Intermediate

Why: Real-world complexity, teaches transactions

What to build:

• Products with variants (size, color)
• Inventory tracking
• Shopping cart (session-based)
• Order creation with transactions

What you'll learn:

• Database transactions
• Concurrent updates (Go's strength)
• Redis caching for cart
• Complex queries with GORM

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3. File Upload Service 🌟 Great for Go Features

Why: Teaches Go's concurrency and streaming

What to build:

• Image/document upload
• Thumbnail generation (goroutines!)
• S3/local storage
• Progress tracking

What you'll learn:

• Go channels and goroutines
• File I/O patterns
• Multipart form handling
• Background processing

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4. Notification System 🌟 Advanced

Why: Utilizes RabbitMQ worker architecture

What to build:

• Multi-channel notifications (email, SMS, push)
• Template system
• Queue-based delivery
• Retry logic

What you'll learn:

• Message queue patterns
• Worker processes
• Error handling strategies
• Go's interface power

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5. Real-time Chat API 🌟 Explores Go's Strengths

Why: WebSockets, concurrency, real-time

What to build:

• Chat rooms
• Direct messages
• Online status
• Message history

What you'll learn:

• WebSocket with Fiber
• Goroutines for real-time
• Redis pub/sub
• Connection management

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Quick Start Recommendation

For your first learning project, I suggest:

"Extended Todo with Teams"

Build on the existing todo-list by adding:

1. Teams/Workspaces (users can create teams)
2. Shared todos (assign todos to team members)
3. Comments on todos
4. File attachments
5. Activity feed (using RabbitMQ)

Why this is perfect:

• 70% of the code already exists
• You'll modify existing patterns (learn by doing)
• Covers relationships, uploads, and queues
• Small enough to complete, big enough to learn

Time estimate: 2-3 days for a Rails dev learning Go

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Key Differences to Remember (Rails → Go)

Concept	Rails	Go
Type Safety	Dynamic	Strict static typing
Error Handling	Exceptions	Explicit err returns
Concurrency	Threads/Fibers	Goroutines (way better!)
ORM	ActiveRecord (magical)	GORM (explicit)
Dependencies	Gemfile	go.mod
Nil checks	present?	if obj != nil everywhere
Testing	RSpec DSL	Table-driven tests