Values of fields in Rules

Hi,

when i create rule(on insert) on view(select id, name from users), i 
will recieve values that were inserted in form of reference words 
new.id, new.name.

if i insert into users (id, name) values (null, null);
then new.id = null and new.name = null

if i insert into users (name) values (null);
then new.id = null and new.name = null

is there any way how to distinguish that id column wasnt explicitly named?