Rails 3 beta

I had problem installing Rails 3 beta. gem install rails --pre asked for rack >= 1.0.0 though I had rack 1.1.0 installed. After manual installation of rack 1.0.1 previous install instruction installed rails 2.3.3. Problem was in gem sources ( check yours with gem sources). I had http://gems.rubyonrails.com there. Just remove it ((sudo) gem sources -r http://gems.rubyonrails.com) and rails 3.beta will be installed.

Just my 2 cents.

Helpers and Rails Engines notice!

One more info for using Rails Engines. Helpers are not included automatically. You need to place

config.to_prepare do
ApplicationController.helper(MyEngineHelper)
end

in init.rb of your plugin