gistfile1.txt

config.to_prepare do
  ::Dragonfly[:images].configure do |c|
    c.define_url do |app, job, opts|
      thumb = Thumb.find_by_job(job.serialize)
      if thumb
        app.datastore.url_for(thumb.uid)
        app.cache_duration = 3600*24*7
      else
        app.server.url_for(job)
        app.cache_duration = 3600
      end
    end

    c.server.before_serve do |job, env|
      uid = job.store
      Thumb.create!( :uid => uid, :job => job.serialize )
    end
  end
end