There is a way to execute the code and then redirect inside the routes file as follows:
get 'cache/clear' => Proc.new { Rails.cache.clear && redirect('/') }
I just don't want to create a controller for this particular action.
Yeah. See here: http://www.railsdispatch.com/posts/rails-routing
match "/foo", :to => proc {|env| [200, {}, ["Hello world"]] }
or more specifically for your case
match "cache/clear", :to => redirect {Rails.cache.clear && '/'}