I stumbled upon the weird behavior of my rails4 app that changes I made were not reload e.g. on page refresh.
I recently installed the spring gem which made my rpsec tests incredibly fast. So I assumed it might be a side effect that files are not getting reloaded in the server but this gem should also detect changes once you edit a file.
Anyhow I stumbled upon another config value in rails
After changing this value to false in development.rb all changes got reloaded on page refresh.
config.reload_classes_only_on_change = false