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copied!<p>Finally found a question and answer:<br> Q: <a href="https://stackoverflow.com/questions/543961/warm-up-cache-on-deployment">"Warm Up Cache" on deployment</a><br> A: <a href="https://stackoverflow.com/a/942774/593053">https://stackoverflow.com/a/942774/593053</a><br></p> <p>Leaving my question here so that others can follow the trail and learn from my pain.</p> <p>Also relevant: <a href="https://stackoverflow.com/questions/9423511/rails-3-2-pre-render-bake-a-new-page-cache-immediately-after-expiry">Rails 3.2: Pre-render (bake) a new page cache immediately after expiry?</a></p> <p>My full solution was to adopt the convention that if <code>cache=regen</code> is in a requested URL, that means that the generated page should be stuffed into the cache.</p> <p>For controllers for which I want caching, <code>include CacheRegen</code>. <code>CacheRegen</code> causes the controller to not read from cache when cache=regen, and to not put cache=regen into the key when storing in the cache.</p> <p>The code for which is:</p> <pre><code>module CacheRegen def read_fragment(key, options = nil) if /cache=regen/.match(key) logger.info("forcing cache miss due to param cache=regen, key=#{key}") return nil end super(key, options) end def write_fragment(key, content, options = nil) unless key.sub!(/cache=regen/, '').nil? key.sub!(/\?\&/, '?') key.sub!(/\&\&/, '&') key.sub!(/\?$/, '') key.sub!(/\&$/, '') logger.info("wrote page to cache with key #{key}") end super(key, content, options) end end </code></pre> <p>Finally, I put the following code in new_pages.rake:</p> <pre><code>require 'action_dispatch' def get_url(sess, url) uri = "http://YOURSITE.com/" + url + "cache=regen" puts "retrieving " + uri foo = sess.get(uri) puts "got it. #{foo}, #{sess.response.body.length} bytes" end desc "If necessary, generate new versions of the most expensive pages" task :new_pages => :environment do puts "Updating pages..." sess = ActionDispatch::Integration::Session.new(Rails.application) ["controller1", "controller2", "controller3"].each { |noun| get_url(sess, noun + "?") } puts "done." end </code></pre> <p>And in my environment, I have a <code>deploy</code> task which depends on the <code>new_pages</code> task.</p> <p>Is there some gem out there that makes all this more automagical?</p>

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