Fix/sqlalchemy 2.0 compatibility - chapter6 UoW#110
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rickywesker wants to merge 67 commits intocosmicpython:chapter_05_uow_exercisefrom
Open
Fix/sqlalchemy 2.0 compatibility - chapter6 UoW#110rickywesker wants to merge 67 commits intocosmicpython:chapter_05_uow_exercisefrom
rickywesker wants to merge 67 commits intocosmicpython:chapter_05_uow_exercisefrom
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- Replace deprecated mapper() with registry.map_imperatively() - Replace session.query() with session.scalars(select()) - Wrap raw SQL strings with text() - Replace clear_mappers() with mapper_registry.dispose() - Update requirements.txt to require sqlalchemy>=2.0
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Pull request overview
This PR updates the Cosmic Python book Chapter 6 exercise code to be compatible with SQLAlchemy 2.0, migrating away from deprecated APIs to modern SQLAlchemy 2.0 patterns.
Changes:
- Replaced deprecated
mapper()withregistry.map_imperatively()in ORM configuration - Updated repository queries from
session.query()tosession.scalars(select()) - Replaced
clear_mappers()withmapper_registry.dispose()in test fixtures - Wrapped raw SQL strings with
text()for SQLAlchemy 2.0 compatibility - Updated requirements to specify
sqlalchemy>=2.0 - Consolidated mypy configuration for pytest and sqlalchemy imports
Reviewed changes
Copilot reviewed 23 out of 29 changed files in this pull request and generated 11 comments.
Show a summary per file
| File | Description |
|---|---|
| src/allocation/adapters/orm.py | Updated to use registry and map_imperatively for SQLAlchemy 2.0 |
| src/allocation/adapters/repository.py | Replaced session.query() with session.scalars(select()) |
| tests/conftest.py | Updated mapper cleanup to use mapper_registry.dispose() |
| tests/integration/test_orm.py | Wrapped SQL strings with text(), contains critical bug in assertion order |
| tests/integration/test_repository.py | Wrapped SQL strings with text() |
| tests/integration/test_uow.py | Wrapped SQL strings with text() |
| requirements.txt | Specified sqlalchemy>=2.0 requirement |
| mypy.ini | Consolidated pytest and sqlalchemy ignore settings |
| README.md | Contains minor spelling error in documentation |
| tests/unit/test_*.py | New unit test files for exercises |
| tests/pytest.ini | New pytest configuration |
| tests/e2e/test_api.py | New end-to-end API tests |
| src/allocation/service_layer/*.py | New service layer files for UoW exercises |
| src/allocation/entrypoints/flask_app.py | New Flask application entrypoint |
| src/allocation/domain/model.py | Domain model definitions |
| src/allocation/config.py | Configuration for database and API connections |
| Dockerfile, docker-compose.yml, Makefile, .travis.yml, src/setup.py | Infrastructure and build configuration files |
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Hi Harry! 👋
I'm a reader following along with the Cosmic Python book, and I really enjoyed Chapter 6 on the Unit of Work pattern!
While working through the exercises on the
chapter_06_uow_exercisebranch, I noticed the code wasn't compatible with SQLAlchemy 2.0, which caused some errors when running tests. So I made the necessary updates to get everything working smoothly.Changes
orm.py: Replace deprecatedmapper()withregistry.map_imperatively()repository.py: Replacesession.query()withsession.scalars(select())conftest.py: Replaceclear_mappers()withmapper_registry.dispose()test_*.py: Wrap raw SQL strings withtext()requirements.txt: Requiresqlalchemy>=2.0Test Results
All existing tests pass (20 passed, 3 skipped, 4 failed).
The 4 failed tests are expected - they are exercise-related tests designed to fail until the reader implements the UnitOfWork pattern.
I hope this PR can help other readers who encounter the same issue, and save them some debugging time! 🙏
Thank you for writing such a great book! 📚