Clear Memcached on Heroku Deploy

Question

What is the best way to automatically clear Memcached when I deploy my rails app to Heroku?

I\'m caching the home page, and when I make changes and redeploy, the pag

Answer 1

[On the Celadon Cedar Stack]

-- [Update 18 June 2012 -- this no longer works, will see if I can find another workaround]

The cleanest way I have found to handle these post-deploy hooks is to latch onto the assets:precompile task that is already called during slug compilation. With a nod to asset_sync Gem for the idea:

Rake::Task["assets:precompile"].enhance do
  # How to invoke a task that exists elsewhere
  # Rake::Task["assets:environment"].invoke if Rake::Task.task_defined?("assets:environment")

  # Clear cache on deploy
  print "Clearing the rails memcached cache\n"
  Rails.cache.clear
end

I just put this in a lib/tasks/heroku_deploy.rake file and it gets picked up nicely.