It's easy if you stick with vanilla Rails. Where it gets complicated is if your team decides to use a different view language, a decorator gem, a factory framew

It's easy if you stick with vanilla Rails. Where it gets complicated is if your team decides to use a different view language, a decorator gem, a factory framework, and a different testing framework. The more deviations from Rails proper, the higher the learning curve gets. If a person know Git, HTML, JavaScript, and one server-side language, I can teach them enough Rails to build production apps in a few weeks. I've had a lot of success with that.