http://erniemiller.org/2010/03/28/advanced-activerecord-3-queries-with-arel/
http://erniemiller.org/2010/05/11/activerecord-relation-vs-arel/
http://www.slideshare.net/flah00/activerecord-arel
http://api.rubyonrails.org/classes/ActiveRecord/QueryMethods.html
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