title: Redmine pg error on heroku
body: <p>I installed the latest version of redmine with rails 3.2.6. It works fine in development on a mysql database, but I uploaded it to heroku, which uses postgres. I get this error related to the Setting model and I can't view any page. </p>
  
  <pre><code>Processing by WelcomeController#index as HTML
  Completed 500 Internal Server Error in 5ms
  
  ActiveRecord::StatementInvalid (PG::Error: ERROR:  relation "settings" does not exist
  :SELECT a.attname, format_type(a.atttypid, a.atttypmod), d.adsrc, a.attnotnull
  FROM pg_attribute a LEFT JOIN pg_attrdef d
  ON a.attrelid = d.adrelid AND a.attnum = d.adnum
  WHERE a.attrelid = '"settings"'::regclass
  AND a.attnum &gt; 0 AND NOT a.attisdropped
  ORDER BY a.attnum
  ):
  app/models/setting.rb:152:in `check_cache'
  app/controllers/application_controller.rb:81:in `user_setup'
  </code></pre>
  
  <p>I tried debugging it but it seems like anything related to the settings model has problems. Just wondered if anyone ran into this problem or can offer insight.</p>