Rails - Jun 2005 - ActiveRecord find with :include more than one level deep

If I have three tables, A, B, and C and:

A has_and_belongs_to_many B
B belongs_to C

can I do a find that will query out all the Bs and their  
corresponding Cs for a particular set of As (with a single SQL query)?

Getting the A query to include the Bs is easy:

A.find(:all, :conditions => [...], :include => [:b]

but I can''t see a way to go a level deeper and include the Cs.


Presuming I have to manually build some SQL for this, how do I then  
use that SQL to sensibly populate Rails objects such that A.bs will  
contain the array of Bs, and A.bs[...].c will contain the associated  
C for a particular B?

(I hope all these ABCs don''t make the description so abstract that  
nobody can follow it!)

Cheers,

Pete Yandell