Ask HN: How do you mentally manage all the Ruby on Rails code?

I'm just starting to learn rails, and it seems that the mental load that comes from frequent context switch among files is enormous. Sometimes I forget what I was doing while I'm switching from one file to another. I know there are a lot of rails programmers on Hacker news, so wanted to ask:

Do you all have this problem? Or is this something that only newbies suffer from? Is there an effective design pattern that helps you code without confusion?