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add_foreign_key() on_delete= and on_update= parameters, closes #530

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table.add_foreign_key() now accepts on_delete= and on_update= to
create foreign keys with ON DELETE/ON UPDATE actions:

    table.add_foreign_key("author_id", "authors", "id", on_delete="CASCADE")

Works for compound foreign keys too.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Simon Willison 2026-07-05 15:49:20 -07:00
commit 0ec0180405
4 changed files with 61 additions and 3 deletions
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@ -23,6 +23,7 @@ Compound foreign key support:
Other foreign key improvements:
- ``ForeignKey`` now exposes ``on_delete`` and ``on_update`` fields reflecting the foreign key's ``ON DELETE``/``ON UPDATE`` actions, and ``table.transform()`` preserves those actions. Previously a transform silently stripped clauses such as ``ON DELETE CASCADE`` from the table schema.
- ``table.add_foreign_key()`` accepts new ``on_delete=`` and ``on_update=`` parameters for creating foreign keys with actions, e.g. ``table.add_foreign_key("author_id", "authors", "id", on_delete="CASCADE")``. (:issue:`530`)
- Foreign keys declared as ``REFERENCES other_table`` with no explicit column are now resolved to the other table's primary key by ``table.foreign_keys``, instead of reporting ``other_column=None``.
- Fixed a ``TypeError`` when sorting ``ForeignKey`` objects where some were compound.