issues: 1605959201

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association pull_request body repo type active_lock_reason performed_via_github_app reactions draft state_reason
1605959201 I_kwDOBm6k_c5fuP4h 2032 datasette errors when foreign key integrity is enabled 193185 open 0     0 2023-03-02T01:27:51Z 2023-03-02T01:31:58Z   CONTRIBUTOR  

By default, SQLite does not enforce foreign key constraints. I typically enable these checks by running:

sql PRAGMA foreign_keys = ON;

inside of a prepare_connection hook.

If a plugin causes the schema to change (eg datasette-scraper creating a new table, or datasette-edit-schema changing a column), then https://github.com/simonw/datasette/blob/0b4a28691468b5c758df74fa1d72a823813c96bf/datasette/utils/internal_db.py#L71-L77 will fail with:

FOREIGN KEY constraint failed

This could be resolved by either: - deleting from the tables column last - changing the schema so that the foreign keys have ON DELETE CASCADE

Let me know if you'd be open to a PR that addresses this -- since foreign key constraints aren't enabled by default, I guess it's questionable whether this is a bug. I think I can workaround this by inspecting the database parameter in prepare_connection and trying not to enable fkey checks on the _internal database.

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