spree/spree — pull request #2844 by kei-s (2013-04-08 10:52:40+00:00)
Title: Fix last_incomplete_spree_order to return 'last' order

`order('created_at DESC').last` equals `order('created_at ASC').first`.
So, this method returns "earliest" order.

This PR fixes it with `order('created_at DESC').first`.