From: Erik Veenstra <erikveen@...>
Date: 2008-08-12T00:48:19+09:00
Subject: Re: Sort array by two attributes? (like sql "order by A, B")

> That's a neat trick, thanks!  I actually like the first one better
> though as you can swap a & b around in each test to get (eg) sorted by
> name ascending and then a date field descending.

Just use -x.b:

a.sort_by{|x| [x.name, -x.date]}

Sort_by is much faster than sort with a block.

gegroet,
Erik V.