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While the standard Rails caching mechanisms are useful in many ways, they have their limitations. Page and action caching in particular aren t very useful in applications where the user is shown personalized and highly dynamic content. Fragment caching can be used in many of these cases, but it s kind of cumbersome, and many feel it s done in the wrong place on the view level. To address this in a real-world situation, The Robot Co-op has developed and released another library, cached_model. cached_model creates a new subclass of ActiveRecord::Base, which automatically caches the model in memcached. In our application, an obvious model to cache is Book. Another one would be the shopping cart, but we already took care of it with fragment caching. As usual, installing the cached_model gem is simple: $ sudo gem install memcache-client $ sudo gem install cached_model

4. In the second box, enter 5. 5. Select Items in the third box, select Sum of TotalFee in the last box, and then click the OK button. The pivot table shows only the five days that have the highest grand totals for the TotalFee field.

cached_model uses memcache-client, a replacement client for ruby-memcache. It should be a drop-in replacement and compatible with fragment caching in Rails. However, as of this writing, there were some compatibility issues, so we ll keep the old library around as well. Now restart the application server and make sure that everything is still working with the new setup. Next, we need to make our application use the new gem. Add the following to config/ environments/production.rb: require 'cached_model' memcache_options = { :c_threshold => 10_000, :compression => true, :debug => false, :namespace => 'emporium_production', :readonly => false, :urlencode => false } CACHE = MemCache.new memcache_options CACHE.servers = 'localhost:11211' In order to make other environments work with CachedModel, you need to add the preceding lines to all used environments in config/environments. Be sure to give them a different namespace name, though, so that the caches won t clash. Now all we need to do to make the Book model cached is to change the first line in app/ models/book.rb, and make the class inherit from CachedModel instead of ActiveRecord::Base: class Book < CachedModel acts_as_taggable ... If you now restart the application server and load a book page a couple times in the browser, you should see (if you re still running the memcached server in the foreground) that the book object is stored in memcached on the first request and fetched from there on the subsequent page loads: <10 new client connection <10 get emporium_production:active_record:Book:15 >10 END <10 set emporium_production:active_record:Book:15 1 900 193 >10 STORED <8 get emporium.com:3000/cart/show/107 >8 sending key emporium.com:3000/cart/show/107 >8 END <10 get emporium_production:active_record:Book:15 >10 sending key emporium_production:active_record:Book:15 >10 END

Note If there are ties in the Grand Total values, more than the specified number of items may be returned

Summary

On the second line, memcached checks whether book number 15 exists in the cache. It doesn t, so on the fourth line, it caches the object and confirms this by outputting STORED. When the page is requested again, the book (as well as the shopping cart fragment) is found from the cache. cached_model expires the cached model objects automatically every 15 minutes (you can adjust this by setting CachedModel.ttl). Since it s tightly integrated with ActiveRecord, expiring objects when they are updated is taken care of automatically.

In the previous filter, you viewed top items Now that you have seen the top five days, you ll focus on days with the lowest amount of fees collected You could filter for a specific number of days, as you did for the top days Instead, you ll filter the pivot table to show the days that comprise the bottom 10 percent of the total fees First you ll clear the filter to see the grand total when all records are visible: 1 Right-click a cell in the WorkDate labels, click Filter, and then click Clear Filter from WorkDate With all the records visible, the pivot table shows a grand total of $634,37628 for the sum of TotalFee You ll filter the pivot table to see the days with the lowest totals for TotalFee that combine to total 10 percent of that overall grand total, or approximately $63,437 2.

Tip For more information about cached_model and how to use memcache-client directly to cache arbitrary things like collections of objects (cached_model doesn t help if you use find(:all), for example), read Geoffrey Grosenbach s excellent tutorial memcached Basics for Rails at http://nubyonrails.com/ articles/2006/08/17/memcached-basics-for-rails.