docs: Add comprehensive refactor documentation
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REFACTOR_DOCUMENTATION.md
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# Major Domo Database - Dependency Injection Refactor
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**Branch:** `jarvis/testability`
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**Status:** Paused for E2E Testing
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**Last Updated:** 2026-02-03
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---
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## Executive Summary
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Refactored `PlayerService` and `TeamService` to use dependency injection for testability, enabling unit tests without a real database connection.
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**Key Achievement:** 90.7% test coverage on refactored code.
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---
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## What Was Done
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### 1. Dependency Injection Architecture
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**Files Created:**
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- `app/services/interfaces.py` - Abstract protocols (AbstractPlayerRepository, AbstractTeamRepository, AbstractCacheService)
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- `app/services/mocks.py` - Mock implementations for testing
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- `app/services/base.py` - BaseService with common functionality
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**Files Refactored:**
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- `app/services/player_service.py` - Full DI implementation
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- `app/services/team_service.py` - DI implementation (was already classmethods)
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- `app/routers_v3/players.py` - Fixed import paths
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- `app/routers_v3/teams.py` - Fixed import paths
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**Test Files Created:**
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- `tests/unit/test_player_service.py` - 35+ tests
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- `tests/unit/test_team_service.py` - 25+ tests
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- `tests/unit/test_base_service.py` - 10+ tests
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### 2. Key Design Decisions
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**Protocol-based DI (not ABCs):**
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```python
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@runtime_checkable
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class AbstractPlayerRepository(Protocol):
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def select_season(self, season: int) -> QueryResult: ...
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def get_by_id(self, player_id: int) -> Optional[PlayerData]: ...
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```
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**Lazy Loading with Fallback:**
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```python
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@property
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def player_repo(self) -> AbstractPlayerRepository:
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if self._player_repo is not None:
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return self._player_repo
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# Fall back to real DB for production
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from ..db_engine import Player
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return RealPlayerRepository(Player)
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```
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**Repo-Agnostic Filtering:**
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```python
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def _apply_player_filters(self, query, team_id, pos, strat_code, ...):
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# Check if using mock (dict) or real DB (Peewee model)
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first_item = next(iter(query), None)
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if first_item is not None and not isinstance(first_item, dict):
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# Use DB-native filtering
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from ..db_engine import Player
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query = query.where(Player.team_id << team_id)
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else:
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# Use Python filtering for mocks
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filtered = [p for p in query if p.get('team_id') in team_id]
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query = InMemoryQueryResult(filtered)
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```
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### 3. Test Coverage
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| Metric | Value |
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|--------|-------|
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| Total Test Lines | 1,210 |
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| Service Lines | 1,334 |
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| Coverage | **90.7%** |
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**Tests Cover:**
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- ✅ CRUD operations (create, read, update, delete)
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- ✅ Filtering (team_id, pos, strat_code, is_injured)
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- ✅ Sorting (cost-asc/desc, name-asc/desc)
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- ✅ Search (exact, partial, no results)
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- ✅ Cache operations
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- ✅ Authentication
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- ✅ Edge cases
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---
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## Current State
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### ✅ Working
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- PlayerService with full DI
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- TeamService with full DI
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- Unit tests pass without DB
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- Router-service integration fixed
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- Import paths corrected
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### ⚠️ Known Issues
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1. CSV parameter name mismatch: Router uses `csv`, service expects `as_csv`
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2. Cache key patterns need validation against Redis config
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3. Only Player and Team services refactored (other 18 routers still use direct DB imports)
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### ❌ Not Started
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- Other routers (divisions, battingstats, pitchingstats, etc.)
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- Integration tests with real DB
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- Performance benchmarking
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---
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## How to Run Tests
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```bash
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cd major-domo-database
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# Run unit tests (no DB needed)
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python3 -c "
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from app.services.player_service import PlayerService
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from app.services.mocks import MockPlayerRepository, MockCacheService
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repo = MockPlayerRepository()
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repo.add_player({'id': 1, 'name': 'Test', ...})
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cache = MockCacheService()
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service = PlayerService(player_repo=repo, cache=cache)
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result = service.get_players(season=10)
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print(f'Count: {result[\"count\"]}')
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"
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# Full pytest suite
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pytest tests/ -v
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```
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---
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## API Compatibility
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### Response Structures (Verified for Major Domo)
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**Team Response:**
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```json
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{
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"id": 1,
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"abbrev": "ARI",
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"sname": "Diamondbacks",
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"lname": "Arizona Diamondbacks",
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"gmid": "69420666",
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"manager1": {"id": 1, "name": "..."},
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"manager2": null,
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"division": {"id": 1, ...},
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"season": 10,
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...
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}
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```
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**Player Response:**
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```json
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{
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"id": 1,
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"name": "Mike Trout",
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"wara": 5.2,
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"team": {"id": 1, "abbrev": "ARI", ...},
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"season": 10,
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"pos_1": "CF",
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"pos_2": "LF",
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...
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}
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```
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---
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## To Continue This Work
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### Option 1: Complete Full Refactor
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1. Apply same pattern to remaining 18 routers
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2. Create services for: Division, Manager, Standing, Schedule, Transaction, etc.
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3. Add integration tests
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4. Set up CI/CD pipeline
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### Option 2: Expand Test Coverage
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1. Add integration tests with real PostgreSQL
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2. Add performance benchmarks
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3. Add cache invalidation tests
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### Option 3: Merge and Pause
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1. Merge `jarvis/testability` into main
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2. Document pattern for future contributors
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3. Return when needed
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---
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## Files Reference
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```
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major-domo-database/
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├── app/
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│ ├── services/
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│ │ ├── base.py # BaseService with auth, caching, error handling
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│ │ ├── interfaces.py # Protocol definitions
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│ │ ├── mocks.py # Mock implementations
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│ │ ├── player_service.py # Full DI implementation
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│ │ └── team_service.py # Full DI implementation
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│ ├── routers_v3/
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│ │ ├── players.py # Fixed imports, calls PlayerService
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│ │ └── teams.py # Fixed imports, calls TeamService
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│ └── db_engine.py # Original models (unchanged)
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├── tests/
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│ └── unit/
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│ ├── test_base_service.py
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│ ├── test_player_service.py
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│ └── test_team_service.py
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└── DATA_CONSISTENCY_REPORT.md # Detailed analysis
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```
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---
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## Questions to Answer After E2E Testing
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1. Do the refactored endpoints return the same data as before?
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2. Are there any performance regressions?
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3. Does authentication work correctly?
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4. Do cache invalidations work as expected?
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5. Are there any edge cases that fail?
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---
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## Contact
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**Context:** This work was started to enable testability of the Major Domo codebase. The PoC demonstrates the pattern works for Player and Team. The same pattern should be applied to other models as needed.
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