Here's the scenario:
create table a (
id serial primary key,
val text
);
create table b (
id serial primary key,
a_id integer references a(id)
);
create rule a_inserted as on insert to a do also insert into b (a_id) values (new.id);
I'm trying to create a record in b
referencing to a
on insertion to a
table. But what I get is that new.id
is null, as it's automatically generated from a sequence. I also tried a trigger AFTER
insert FOR EACH ROW
, but result was the same. Any way to work this out?
Avoid rules, as they'll come back to bite you.
Use an after trigger on table a that runs for each row. It should look something like this (untested):
create function a_ins() returns trigger as $$
begin
insert into b (a_id) values (new.id);
return null;
end;
$$ language plpgsql;
create trigger a_ins after insert on a
for each row execute procedure a_ins();