docs: add complete alembic integration example#1741
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Expand the migrations/Alembic docs with a working, end-to-end example: - Explain where the SQLAlchemy MetaData comes from in ormar and how to expose it for Alembic. - Add a sample project layout with my_project/models.py, alembic.ini, and alembic/env.py. - Show how to handle models split across multiple apps/packages by importing all models before Alembic reads the metadata. - Keep the existing compare_type and include_object tips intact. Fixes ormar-orm#1400
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Fixes #1400.
The current Alembic docs skip too many steps for anyone new to ormar — imports, where
metadatacomes from, and how to handle models split across apps. I added a complete, working example based on the FastAPI-template reference linked in the issue.It covers a single-file layout, a multi-app layout, a minimal
alembic.ini, and wiring the sharedmetadataintoalembic/env.py. I ranalembic revision --autogenerateandalembic upgrade headagainst both layouts and built the docs withmkdocs buildto make sure everything works.