From: Matt Darby <matt@...>
Date: 2008-06-30T00:12:26+09:00
Subject: Re: Recursive Logic - Examples and Resources?

> So, if the set is 1 2 3 4 5 6 7 8 9 10, and User1 has (9, 17), while
> User2 has (3, 7), User2 could be part of the set, while User1 could not.

This approach is pretty naive, but it might work:

range = 0...10
User.find(:all, :conditions => ["num1 IN (?) and num2 IN (?)", range,
range])