[Rails] How to recursively count threads belonging to a chain of forums

class Forum::Forum < ActiveRecord::Base
belongs_to :parent_forum, :class_name => "Forum"
has_many :sub_forums, :class_name => "Forum", :foreign_key =>
:parent_id
has_many :threads

def count_threads
threads.count
end
end

Hi I am trying to count all the threads that belong to a forum right
though the chain. Currently it counts the threads that belong to the
forum you're on, so if you're on forum id 1 it will count threads that
belong to forum id 1 only, however forum id 1 also has sub_forums such
as forum id 4 which also has a sub_forum with a id of 8 and this could
go on forever.

I would really appreciate some help here, I have grand plans to build my
site in rails instead of zend framework but a few little snags are
keeping me stuck sometimes.

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