Clear cache DelayJobPaperclip This is a monkey patch to clear a cache after an image is done processing.

delayed_paperclip.rb

module DelayedPaperclip
  module Jobs
    class DelayedJob
      def perform
        DelayedPaperclip.process_job(instance_klass, instance_id, attachment_name)
        clear_cache(instance_klass, instance_id)
      end

      def clear_cache(instance_klass, instance_id)
        begin
          ActionController::Base.new.expire_fragment instance_klass.constantize.find(instance_id).cache_key
        rescue NoMethodError
        end
      end
    end
  end
end

user.rb

class User < ActiveRecord::Base
...

 # There must be a better way...
 # But the it seems I cannot access the hostname within a model
 def cache_key
    "localhost:3000/#{nickname}"
 end

...
end