Re: [HACKERS] GSoC 2017: Foreign Key Arrays

On Tue, Jan 26, 2021, at 12:59, Mark Rofail wrote:
> Please don't hesitate to give your feedback.

The error message for insert or update violations looks fine:

UPDATE catalog_clone.pg_extension SET extconfig = ARRAY[12345] WHERE oid = 10;
ERROR: insert or update on table "pg_extension" violates foreign key constraint "pg_extension_extconfig_fkey"
DETAIL: Key (EACH ELEMENT OF extconfig)=(12345) is not present in table "pg_class".

But when trying to delete a still referenced row,
the column mentioned in the "EACH ELEMENT OF" sentence
is not the array column, but the column in the referenced table:

DELETE FROM catalog_clone.pg_class WHERE oid = 10;
ERROR: update or delete on table "pg_class" violates foreign key constraint "pg_extension_extconfig_fkey" on table "pg_extension"
DETAIL: Key (EACH ELEMENT OF oid)=(10) is still referenced from table "pg_extension".

I think either the "EACH ELEMENT OF" part of the latter error message should be dropped,
or the column name for the array column should be used.

/Joel