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

25 Jan 2013: this is works for a Rails 3.2.11 app running on Ruby 1.9.3 on Cedar

In your Gemfile add the following line to force ruby 1.9.3:

ruby '1.9.3'

Create a file named lib/tasks/clear_cache.rake with this content:

if Rake::Task.task_defined?("assets:precompile:nondigest")
  Rake::Task["assets:precompile:nondigest"].enhance do
    Rails.cache.clear
  end
else
  Rake::Task["assets:precompile"].enhance do
    # rails 3.1.1 will clear out Rails.application.config if the env vars
    # RAILS_GROUP and RAILS_ENV are not defined. We need to reload the
    # assets environment in this case.
    # Rake::Task["assets:environment"].invoke if Rake::Task.task_defined?("assets:environment")
    Rails.cache.clear
  end
end

Finally, I also recommend running heroku labs:enable user-env-compile on your app so that its environment is available to you as part of the precompilation.