10 slaps you better watch out

Transaction mistake:
 http://markdaggett.com/blog/2011/12/01/transactions-in-rails/


Nested Resources
 Why admin separate?
http://www.rubyfleebie.com/restful-admin-controllers-and-views-with-rails/
more
http://tammersaleh.com/posts/almost-painless-nested-resources


Danger in Sessions
http://asciicasts.com/episodes/13-dangers-of-model-in-session

Watch out for kaminari
http://bibwild.wordpress.com/2011/07/14/kaminari-dangerous-for-high-page-counts/