What happened to asset_host in rails 3? Earlier I can put following code into development.rb and get all assets not present on development:
ActionController::Base.asset_host = proc do |source, request|
unless File.exist?(File.join(RAILS_ROOT, 'public', source.sub(/\?\d+$/, '')))
'http://example.com'
end
end
But in rails 3 there is no such method and google does not help me.