As you say, counter_cache seems to be the closest to doing it the "rails way". So far I have not encountered any AR defined methods for this specific purpose but this is the closest thing to it that I have seen.
Pretty sure you can do something like this as well if you want.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.