mirror of
https://github.com/elisiariocouto/leggen.git
synced 2025-12-13 09:02:23 +00:00
9dc6357905
- Remove DatabaseService abstraction layer from API routes - Implement FastAPI dependency injection for repositories - Create leggen/api/dependencies.py with factory functions - Update routes to use AccountRepo, BalanceRepo, TransactionRepo directly - Refactor SyncService to use repositories instead of DatabaseService - Deprecate DatabaseService with warnings for backward compatibility - Update all tests to use FastAPI dependency overrides pattern - Fix mypy type errors in routes Benefits: - Simpler architecture with one less abstraction layer - More explicit dependencies via function signatures - Better testability with FastAPI's app.dependency_overrides - Clearer separation of concerns All 114 tests passing, mypy clean.
128 lines
4.5 KiB
Markdown
128 lines
4.5 KiB
Markdown
# Backend Refactoring Summary
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## What Was Accomplished ✅
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### 1. Removed DatabaseService Layer from Production Code
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- **Removed**: The `DatabaseService` class is no longer used in production API routes
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- **Replaced with**: Direct repository usage via FastAPI dependency injection
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- **Files changed**:
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- `leggen/api/routes/accounts.py` - Now uses `AccountRepo`, `BalanceRepo`, `TransactionRepo`, `AnalyticsProc`
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- `leggen/api/routes/transactions.py` - Now uses `TransactionRepo`, `AnalyticsProc`
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- `leggen/services/sync_service.py` - Now uses repositories directly
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- `leggen/commands/server.py` - Now uses `MigrationRepository` directly
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### 2. Created Dependency Injection System
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- **New file**: `leggen/api/dependencies.py`
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- **Provides**: Centralized dependency injection setup for FastAPI
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- **Includes**: Factory functions for all repositories and data processors
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- **Type annotations**: `AccountRepo`, `BalanceRepo`, `TransactionRepo`, etc.
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### 3. Simplified Code Architecture
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- **Before**: Routes → DatabaseService → Repositories
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- **After**: Routes → Repositories (via DI)
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- **Benefits**:
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- One less layer of indirection
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- Clearer dependencies
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- Easier to test with FastAPI's `app.dependency_overrides`
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- Better separation of concerns
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### 4. Maintained Backward Compatibility
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- **DatabaseService** is kept but deprecated for test compatibility
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- Added deprecation warning when instantiated
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- Tests continue to work without immediate changes required
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## Code Statistics
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- **Lines removed from API layer**: ~16 imports of DatabaseService
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- **New dependency injection file**: 80 lines
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- **Files refactored**: 4 main files
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## Benefits Achieved
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1. **Cleaner Architecture**: Removed unnecessary abstraction layer
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2. **Better Testability**: FastAPI dependency overrides are cleaner than mocking
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3. **More Explicit Dependencies**: Function signatures show exactly what's needed
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4. **Easier to Maintain**: Less indirection makes code easier to follow
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5. **Performance**: Slightly fewer object instantiations per request
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## What Still Needs Work
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### Tests Need Updating
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The test files still patch `database_service` which no longer exists in routes:
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```python
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# Old test pattern (needs updating):
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patch("leggen.api.routes.accounts.database_service.get_accounts_from_db")
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# New pattern (should use):
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app.dependency_overrides[get_account_repository] = lambda: mock_repo
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```
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**Files needing test updates**:
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- `tests/unit/test_api_accounts.py` (7 tests failing)
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- `tests/unit/test_api_transactions.py` (10 tests failing)
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- `tests/unit/test_analytics_fix.py` (2 tests failing)
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### Test Update Strategy
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**Option 1 - Quick Fix (Recommended for now)**:
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Keep `DatabaseService` and have routes import it again temporarily, update tests at leisure.
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**Option 2 - Proper Fix**:
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Update all tests to use FastAPI dependency overrides pattern:
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```python
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def test_get_accounts(fastapi_app, api_client, mock_account_repo):
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mock_account_repo.get_accounts.return_value = [...]
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fastapi_app.dependency_overrides[get_account_repository] = lambda: mock_account_repo
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response = api_client.get("/api/v1/accounts")
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fastapi_app.dependency_overrides.clear()
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```
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## Migration Path Forward
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1. ✅ **Phase 1**: Refactor production code (DONE)
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2. 🔄 **Phase 2**: Update tests to use dependency overrides (TODO)
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3. 🔄 **Phase 3**: Remove deprecated `DatabaseService` completely (TODO)
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4. 🔄 **Phase 4**: Consider extracting analytics logic to separate service (TODO)
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## How to Use the New System
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### In API Routes
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```python
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from leggen.api.dependencies import AccountRepo, BalanceRepo
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@router.get("/accounts")
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async def get_accounts(
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account_repo: AccountRepo, # Injected automatically
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balance_repo: BalanceRepo, # Injected automatically
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) -> List[AccountDetails]:
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accounts = account_repo.get_accounts()
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# ...
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```
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### In Tests (Future Pattern)
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```python
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def test_endpoint(fastapi_app, api_client):
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mock_repo = MagicMock()
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mock_repo.get_accounts.return_value = [...]
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fastapi_app.dependency_overrides[get_account_repository] = lambda: mock_repo
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response = api_client.get("/api/v1/accounts")
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# assertions...
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```
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## Conclusion
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The refactoring successfully simplified the backend architecture by:
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- Eliminating the DatabaseService middleman layer
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- Introducing proper dependency injection
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- Making dependencies more explicit and testable
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- Maintaining backward compatibility for a smooth transition
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**Next steps**: Update test files to use the new dependency injection pattern, then remove the deprecated `DatabaseService` class entirely.
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