camper/deploy/ensure_role_exists.sql

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-- Deploy camper:ensure_role_exists to pg
-- requires: roles
-- requires: schema_camper
-- requires: company_user
begin;
set search_path to camper, public;
create or replace function ensure_role_exists() returns trigger as
$$
begin
if not exists (select 1 from pg_roles where rolname = new.role) then
raise foreign_key_violation using message = 'role not found: ' || new.role;
end if;
return new;
end;
$$
language plpgsql;
comment on function ensure_role_exists() is
'Makes sure that a role given to a user is a valid, existing role in the cluster.';
revoke execute on function ensure_role_exists() from public;
create trigger ensure_role_exists
after insert or update
on company_user
for each row
execute procedure ensure_role_exists();
commit;