Heroku Rails 3 Rails.cache.class reports ActiveSupport::Cache::FileStore after I call Rails.application.config.cache_store = :redis_store, "#{url}"

Question

Where url=redis://redistogo:XXXYYYZZZ@cod.redistogo.com:9362/

This is called in my initializer code.

Here is the other pertinent config options:

1) in production.rb

config.action_controller.perform_caching = true in my production.rb

2) In my controller:

caches_action :show, :layout => false, :if => Proc.new {|c| c.request.query_string.blank?}  
caches_page :get_session_info

3) in the initializer:

Rails.application.config.cache_store = :redis_store, "#{url}"

PS: I checked this by running a production console from my local machine. I actually re-ran the call to cache_store followed by Rails.cache.class. I ALSO ran the console from the heroku run bash shell (on an actual Heroku dyno) with the same results.

PPS: I think I want to switch to use memcached