The Rubyist's guide to environment variablesThe Rubyist's guide to environment variables By Starr Horne on Jun 9, 2015 If you want to be able to effectively manage web apps in development and in production, you have to understand environment variables. This wasn't always the case. Just a few years ago, hardly anyone was configuring their Rails apps with environment variables. But then Heroku happened. Heroku introduced developers to the 12-
