Rails - Jul 2007 - Using with_scope with more than one model

I''ve seen a lot of usage of with_scope since my last post, and
everywhere I
see code like this:

Mail.with_scope(:find=>{:conditions=>"user_id = ..."}) do
  count = Mail.count
end

Here, both the model used for scoping, and the model inside the scope is the
same. 

I''m trying to do something like this:

class User<ActiveRecord::Base
	def among_friends
		User.with_scope(:find => {:conditions => friends_scope_condition})
{yield}
	end
end

so that I can do stuff like:
		#Find friends'' quotes
                current_user.among_friends do
			@quotes_by_friends = Quote.find(:all, :order=>''created_at
DESC'')
		end 

Unfortunately, this doesn''t work, and to correct the code, I need to
use
Quote.with_scope in the among_friends definition instead.

This defeats the purpose; which was to increase flexibility.

Would appreciate any ideas.
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