Re: Catching unique_violation exception on specific column/index

On Mon, Jun 11, 2018 at 05:10:33PM +0700, Alexey Dokuchaev wrote:
> The usual approach ("EXCEPTION WHEN unique_violation THEN ... END") does
> not really cut it because I want to catch unique_violation only when it
> happens on "foo_key", and still rightfully complain on others. However,
> there is no "EXCEPTION WHEN unique_violation ON (foo_key)" or something.
> Is there a way to do this without using triggers and in a less ugly way
> than the code below?

Oh, I completely forgot about rules:

CREATE OR REPLACE RULE ignore_duplicate_foo AS
ON INSERT TO table_bar WHERE EXISTS (
SELECT 1 FROM table_bar WHERE foo = NEW.foo)
DO INSTEAD NOTHING;

Sorry for the noise.

./danfe