Follow Along as I Stumble on the Path to Learning RoR

Expiring Cache on Rails Using Jobs

I needed to expire caches using jobs.  If I used an observer or a sweeper the updates would happen to often.  I was displaying the info of a bunch of records (foobars) on a single view and I didn’t want it to update every time a Foobar was created – that would be too often and reduce the benefits of caching.

Instead I wanted a job that ran every hour to expire the cache.

  1. First, I installed the Whenever gem which updates the cron file and helping you schedule server jobs.
  2. use the command `wheneverize .` to generate the schedule.rb file for Whenever
  3. I created a new rake file, “expire_cache.rake” in lib/tasks
  4. In the file, I put this:task :expire_cache_1_hour => :environment do
    puts “———————expiring 1 hour cache————-”
    ActionController::Base.new.expire_fragment(“foobar”)  #I already had <% cache(‘foobar’) do %> in my view
    end
  5. In the schedule.rb file used by Whenever, I added:every 1.hour do
    rake “expire_cache_1_hour”
    end
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