anchor.diff:  
   ==== Immutability in Ruby
   
  -* https://deveo.com/blog/2013/03/22/immutability-in-ruby-part-1/[Immutability in Ruby - part 1 of 2]
  -* https://deveo.com/blog/2013/03/28/immutability-in-ruby-part-2/[Entities and value objects in Ruby - part 2 of 2]
  +* link:https://deveo.com/blog/2013/03/22/immutability-in-ruby-part-1/[Immutability in Ruby - part 1 of 2]
  +* link:https://deveo.com/blog/2013/03/28/immutability-in-ruby-part-2/[Entities and value objects in Ruby - part 2 of 2]
   
   * http://voormedia.com/blog/2013/02/creating-immutable-tree-data-structures-in-ruby[Creating immutable tree data structures in Ruby - Feb 2013]
   * http://www.confreaks.com/videos/2337-mwrc2013-immutable-ruby[Immutable Ruby presentation video (25 mins) - Michael Fairley @ MountainWest RubyConf 2013]
  
positive.code: 
  === MongoDB
  
  link:http://speakerdeck.com/u/mongodb/p/domain-driven-design-with-mongodb-chris-hafey-on-point-medical-diagnostics[Presentation on Domain Driven Design with MongoDB]
  link:http://wiki.basho.com/Riak-Compared-to-MongoDB.html[Riak Compared to MongoDB]
  
  === Repository Pattern in Ruby
  
  
negative.code: * https://github.com/brandonweiss/collector[Collector is an implementation of the Repository Pattern for MongoDB]
  * https://github.com/braintree/curator[Curator is a model and repository framework for Ruby].Currently, curator supports Riak, MongoDB and an in-memory data store for persistence.
  
  === Aggregate Update
  
  Tools for Implementing Eventual Consistency (i.e. performing asynchronous updates).
  
  * http://rubylearning.com/blog/2010/11/08/do-you-know-resque[Learning Resque]
  * https://devcenter.heroku.com/articles/queuing-ruby-resque[Queuing in Ruby with Redis and Resque - Heroku Blog]
  * http://rubyamqp.info/articles/getting_started/
  * https://github.com/nesquena/backburner[Simple and reliable beanstalkd job queue for ruby]
  * https://github.com/iron-io/delayed_job_ironmq[IronMQ backend for delayed_job]
  * http://www.iron.io/[IronMQ is the Message Queue for the Cloud], see http://www.iron.io/mq[comparison chart]
  