I would not recommend using a default scope on an ActiveRecord model for 
sorting.

Start your Rails console and try Model.find(1). This will result into: 
SELECT models.* FROM models WHERE models.id=1 ORDER BY id DESC LIMIT 1

This ORDER BY will be included in every unneccessary query. The above query 
will be slower in MySQL than without the ORDER BY clause. Try it yourself!

Create a normal scope and include it with every query where you expect more 
than 1 record as a result.

In case you consider a mixin try 
http://api.rubyonrails.org/classes/ActiveSupport/Concern.html


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