Don't replace spaces with tabs in your .yml files! It does not work. How rubbish is that? yml has to be indented, but you must indent with spaces, and not tabs. This is not something specific to rails though, tabs are forbidden in yml 1. Annoying, a thing that you can't see... This explains why all rails developers use two spaces instead of actual tabs.
Paulʼs blog - I live in Hythe in the deep South. Married + dad to two, I am a full stack web developr, + I do js / node, some ruby, python, php etc. My hobbies are pubs, running, restaurants, home-automation 🤖 and other diy jiggery-pokery, history, tree stuff, television, squirrels, pirates ☠️, lego, + time travel.