Account.find :all, :conditions => [ "updated_on > ? OR id IN (?)",
@last_update,
[ 2, 3, 5, 7, 11 ] ]
It will result in the following SQL:
SELECT *
FROM accounts
WHERE
updated_on > '20061214 15:29:12'
OR id IN (2, 3, 5, 7, 11)