Re: CREATE RULE ignored, what did I do wrong

andrew(at)pillette(dot)com writes:
> Foreign-key constraints:
> "$1" FOREIGN KEY (smoothing_id) REFERENCES smoothing_algorithm(smoothing_id) ON UPDATE CASCADE ON DELETE CASCADE
> Rules:
> del_smoothed_rank_episode AS ON DELETE TO smoothed_rank_episode
> WHERE (NOT old.is_deleted) DO INSTEAD ...

The DELETE commands generated by the foreign key ON DELETE CASCADE will
get rewritten by your ON DELETE rule. You probably do not want to do
this; or at least not make it an INSTEAD rule.

There has been some debate in the past about whether rules should be
able to break foreign-key constraints, but I tend to class it as a
"you should know what you're doing" feature. Preventing this kind
of error would inevitably result in a serious reduction of the power
of the rule feature.

regards, tom lane