Finding your way around a new Rails project

You just changed teams at work, or just started a new job. Or you found a bug in your favorite open-source app, and want to write your first pull request. But after you git clone and open app/models, you’re totally lost. Even though the Rails structure is the same as what you’re used to, it’s impossible to find your way around the code. So what’s the fastest way to learn this new, unfamiliar Rails app?

Build a project vocabulary

What is a Player, and what’s a Session? How about an Account vs...