rails 3 caching: expire action for named route

Question

My controller has this:

caches_action :render_ticker_for_channel, :expires_in => 30.seconds

In my routes file I have this:

Answer 1

caches_action :render_ticker_for_channel, :if => proc do 
  !!params['doCache']
end

But for this solution to work we need to pass an extra param either through query string or post body.