Examples of low level caching

application_controller.rb

class ApplicationController < ActionController::Base
  protect_from_forgery
  before_filter do
    @categories = Rails.cache.fetch("global/categories", expires_in: 10.minutes) do
      Category.where("posts_count > 0").all
    end
  end
end

place.rb

class Place < ActiveRecord::Base
  def flickr_place
    flickr = FlickRaw::Flickr.new
    @flickr_place ||= Rails.cache.fetch("places/#{self.id}-#{self.updated_at}/flickr/place_id", expires_in: 7.days) do
      unless self.latitude.blank? || self.longitude.blank?
        begin
          places = flickr.places.findByLatLon(lat: self.latitude, lon: self.longitude)
          if places.blank?
            nil
          else
            places.first
          end
        rescue Exception => e
          logger.info "Exception occurred fetching Flickr place ID: #{e.to_s}"
          nil
        end
      end
    end
  end
end

Hey, nice demonstration of lower-level caching! Some of the ruby code was bugging me so I forked it and make some tweaks. Hopefully they are helpful and not rage-inducing :)

Awesome, thanks Randy!
I'd made a few of those tweaks on my local code already after someone pointed them out yesterday, but I hadn't thought of using .try; I'm going to use that myself now, as it's quite a bit neater :D