search for: find_with_ids

I have a simple project created around a very, very simple database: one main table packs with just three rows Column | Type | Modifiers --------+-----------------------------+---------------------------------------------------- id | integer | not null default nextval(''packs_id_seq''::regclass) nombre | character

I''m walking through an example in the "Head First Rails" book, but, instead doing the examples using Rails3.0.0.rc. But, I''m getting this error when browsing for example: http://localhost:3000/advs/1 undefined method `eq'' for nil:NilClass Provided that my advs_controller.rb is as follows: http://pastie.org/private/cd9zntg2ite57ept288kfa Any ideas why