Announcing bond, a gem which enhances autocompletion in the rails
console by autocompleting method arguments. It comes with the ability
to autocomplete attribute/column names for any model's class methods
(i.e. create and new) and instance methods (i.e. update_attribute(s)).
It can also autocomplete options (hash keys) to class methods such
AR::Base.establish_connection, find, and all. Users can also define
their own argument autocompletions for any method. To see a screencast
of bond in action, see http://tagaholic.me/2010/05/07/screencast-of-argument-autocompletion-for-methods-in-irb.html
(starting at 3:15 for rails examples).
gem install bond