planetalan/sample_app — pull request #1 by licyeus (2012-04-07 18:46:42+00:00)
Title: Fixing Heroku errors

Googling the error from 'heroku logs -n 500' leads me to http://www.benjaminoakes.com/2011/09/15/activerecordconnectionnotestablished-in-rails-3-1-on-heroku/

Looks like you're requiring ActiveRecord but don't have any db adapter gem in Gemfile. Since you're not using ActiveRecord, grep-ing for 'activerecord' and 'active_record' and removing those references fixes things.