SOLID Ruby - Modular Architecture
Agent Workflow (MANDATORY)
Before ANY implementation, use TeamCreate to spawn 3 agents:
- fuse-ai-pilot:explore-codebase - Analyze existing architecture
- fuse-ai-pilot:research-expert - Verify Ruby/Rails docs via Context7
- fuse-ai-pilot:sniper - Post-implementation validation
DRY - Reuse Before Creating (MANDATORY)
Before writing ANY new code:
- Grep the codebase for similar modules, services, or logic
- Check shared locations:
app/modules/core/services/, app/modules/core/contracts/ - If similar code exists -> extend/reuse instead of duplicate
- If code will be used by 2+ features -> create it in
app/modules/core/
Architecture (Modules MANDATORY)
| Layer | Location | Max Lines |
|---|
| Controllers | app/modules/[feature]/controllers/ | 50 |
| Services | app/modules/[feature]/services/ | 100 |
| Repositories | app/modules/[feature]/repositories/ | 100 |
| Contracts | app/modules/[feature]/contracts/ | 30 |
| Models | app/modules/[feature]/models/ | 50 |
| Shared | app/modules/core/{services,contracts,concerns}/ | - |
NEVER use flat app/ structure - always app/modules/[feature]/
Critical Rules (MANDATORY)
| Rule | Value |
|---|
| File limit | 100 lines (split at 90) |
| Controllers | < 50 lines, delegate to services |
| Contracts | contracts/ directory ONLY (duck typing modules) |
| YARD doc | Every public method documented |
| Frozen string | # frozen_string_literal: true in every file |
| Concerns | Use for shared behavior (like interfaces) |
Reference Guide
Concepts
Templates
Forbidden
| Anti-Pattern | Fix |
|---|
| Files > 100 lines | Split at 90 |
| Business logic in models | Extract to service |
| Fat controllers | Delegate to services |
Flat app/ structure | Use app/modules/[feature]/ |
| God classes | Split by responsibility |