Is "status" a built-in type of scaffold in Rails, or arbitrary?

A scaffold creates the controller, model and test files with basic actions (new, create, edit, update, destroy, show, index) all done for you. Depending on what you are trying to model, it may be faster to just use a scaffold.

Other times you want to have specific actions in your controller, in which case you could create the model and controller separately and they will be empty waiting for you to add them.

I can only answer part of your question but statuses is arbitrary. The statuses in the code was naming the files. I'm not sure though about where to find more types. Most things I've seen are made through a series of scaffolds and relationships. But I'm also not a ruby expert so take what I say with a grain of salt.

Thanks! What threw me off was that the directory name was pluralized "satuses." I figured that was too complicated of a naming scheme to be automatic, but apparently I spoke too soon. So if I'm understanding correctly, a scaffold can be called whatever I want, and it can function differently based on the variables I store in it?