Best find for the job...

Hi all,

I'm trying to find the most effective way to generate an aggregation
report. The models involved are:

Customer --(has_many)--> Charges
Charges --(have_one)-->Account

What I'm trying to do is find the total charges during the year for
each customer by account. In other words, a function like:


in the customer model that will return a hash of each account charged
and the customer's total charges to that account.

From what I've read I don't think I should be using named_scope, since
this involves associations...

Any ideas?


In my opinion, the best way is the first way that works. If that
method proves to be too inefficient, then optimize afterwards.