Mailers, concerns, helpers, observers and a lot of other things in Rails aren't universally used by all apps. Even something as simple as an empty directory and

Mailers, concerns, helpers, observers and a lot of other things in Rails aren't universally used by all apps. Even something as simple as an empty directory and some generators in a stock Rails app would go a long way in educating people that these are patterns that you can use / provide a common language for where these sorts of things should go and what we should call them.