fix: use subscript access in versioned_column_properties

[pReya]

Summary

versioned_column_properties (and the version-table builder that consumes it) currently fails on any model with a column whose name shadows a dict-API attribute of mapper.attrs — most notably values, keys, or items.

getattr(mapper.attrs, key) resolves to the bound method on the underlying ReadOnlyProperties namespace rather than the ColumnProperty, so the next prop.key access in utils.py raises:

AttributeError: 'function' object has no attribute 'key'

This blocks inserts on otherwise-valid versioned models. Switching to subscript (mapper.attrs[key]) bypasses normal attribute resolution and always returns the mapped property.

Changes

• sqlalchemy_history/utils.py: swap getattr(mapper.attrs, key) for mapper.attrs[key] in versioned_column_properties.
• tests/reported_bugs/: new regression test using a model with values, keys, and items columns. Verified to reproduce the original AttributeError against unfixed utils.py and to pass after the fix.
• CHANGES.rst: add an Unreleased entry describing the fix.

Test plan

• New regression test passes against patched utils.py
• New regression test fails on main with the documented AttributeError
• ruff check and ruff format --check clean on changed files
• No change in pass/fail counts on tests/relationships/ between fixed and unfixed builds (pre-existing failures are unrelated)

🤖 Generated with Claude Code

[coveralls]

Coverage Report for CI Build 25663163505

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Coverage: 95.136%

Details

• Patch coverage: 24 of 24 lines across 2 files are fully covered (100%).

Uncovered Changes

No uncovered changes found.

Coverage Regressions

Requires a base build to compare against. How to fix this →

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Coverage Stats

Relevant Lines:	5407
Covered Lines:	5144
Line Coverage:	95.14%
Coverage Strength:	9.45 hits per line

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💛 - Coveralls

[winwinashwin]

Thanks!!