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transform() now round-trips compound foreign keys, refs #594

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Compound foreign keys are passed through table.transform() intact
instead of being degraded to per-column single foreign keys:

- rename= applies to each member column of a compound key
- drop= of any member column drops the whole constraint, matching
  the existing single-column behavior
- drop_foreign_keys= accepts a bare column name (drops any foreign
  key that column participates in) or a tuple of columns (drops the
  compound key with exactly those columns)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Simon Willison 2026-07-05 14:33:15 -07:00
commit 7d43fd50e1
3 changed files with 98 additions and 23 deletions
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10
docs/python-api.rst
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@ -1793,6 +1793,16 @@ This example drops two foreign keys - the one from ``places.country`` to ``count
drop_foreign_keys=("country", "continent")
)
A bare column name drops any foreign key that column participates in, including compound foreign keys. To target a compound foreign key precisely, pass a tuple of its columns:
.. code-block:: python
db.table("courses").transform(
drop_foreign_keys=[("campus_name", "dept_code")]
)
Renaming a column with ``rename=`` updates any foreign keys that use it, and dropping a column with ``drop=`` also drops any foreign keys it participates in - for a compound foreign key this removes the whole constraint.
.. _python_api_transform_sql:
Custom transformations with .transform_sql()