What is the nightmare of every developer? Exactly: Oracle DB. Since it took me some where some > 3 days to figure out how to have an instance of Rails connected to an Oracle Database on my mac, I decided to write this step-by-step guide, hoping to save you some time whenever you will have to face this nightmare.

https://medium.com/@coorasse/rails-oracle-11g-on-macosx-el-capitan-2b4086449c54