Keep your controllers slim by moving all the logic into ONE HUGE HELPER CLASS

Ok this one actually made me lol. Have an upvote!

Ooh I've seen that practice in action..
In some rails project, there was a helpers folder nested in controllers, a {controller}_helper.rb for each controller..

Much trait-itis in PHP.. Unless you have an ide that indexes the methods, well.. Bite me, time to grep or awk for it.

In spring all your hard core logic is in the service layer.

I'm actually guilty of having done this at one stage of my career :(