Renaming a column onto the name of another existing column silently
collapsed the two into one and discarded the source column's entire
dataset, because the new CREATE TABLE column list was built with
dict(new_column_pairs) and the earlier entry was overwritten. Detect
duplicate target names and raise TransformError before any SQL is
executed, leaving the table untouched.
* transform: coerce empty strings to NULL when converting TEXT columns to numeric types
When a TEXT column is transformed to INTEGER, FLOAT, or REAL and a row
contains an empty string, the empty string is now converted to NULL during
the INSERT...SELECT copy, matching the expected behavior described in #488.
Fixes#488
* Automated upgrades by Ruff
uvx --with 'ruff>=0.16.0' ruff check . --fix --unsafe-fixes
* Fix remaining Ruff errors with GPT-5.6 Sol high
https://gist.github.com/simonw/6da7906a9fea6e90da131c21a9055199
* Fix flake E501 long lines
* New Protocol for migrations to make ty happy
> Add a test that covers what happens if you run transform against a table with ON CASCADE DELETE for one of its foreign keys - those records should not be deleted during the transform even though the table is dropped as part of that procedure
* Fix transform() corrupting TRUE/FALSE/NULL column defaults
quote_default_value() passed keyword-literal defaults (TRUE, FALSE, NULL)
through self.quote(), wrapping them in quotes. So transform() rebuilt a
column declared "INTEGER DEFAULT TRUE" as "INTEGER DEFAULT 'TRUE'", and a
later default insert stored the text 'TRUE' instead of the integer 1
(likewise 'FALSE' for 0 and 'NULL' for null) - silent value corruption.
Return these keyword literals unquoted, as already done for the
CURRENT_TIME/DATE/TIMESTAMP literals.
PR #764
* Recreate indexes when calling transform when possible and raise an error when they cannot be retained automatically
* Docs for sqlite_utils.db.TransformError
Co-authored-by: Simon Willison <swillison@gmail.com>
Closes#577
This should solve all sorts of problems seen by users of platforms that throw errors on writable_schema.
Also added `add_foreign_keys=` and `foreign_keys=` parameters to `table.transform()`.
