sferik/rails_admin — pull request #1830 by fabiosegalla (2013-11-05 10:29:53+00:00)
Title: #ruby's #flat_map is much faster than combining #map and #flatten.

According to http://gistflow.com/posts/578-use-flat_map-instead-of-map-flatten I modify CSVConverter.to_csv method for 3-5 % faster performance.