Rails - Sep 2007 - has_many :through distant relationships

I have the following associations:

disks->disks_user_files<-user_files

my models look like:

class Disk < ActiveRecord::Base
 has_many :disk_user_files
 has_many :user_files, through => :disk_user_files
end


class DiskUserFile < ActiveRecord::Base
  belongs_to :disk
  belongs_to :user_file
end

class UserFile < ActiveRecord::Base
  has_many :disk_user_files
  has_many :disks, :through => :disk_user_files
end

So far so good.
I want to extend this to something like

disks->disks_user_files<-user_files<-users

so I add  :belongs_to :user to my UserFile class
and add:

class User < ActiveRecord::Base
  :has_many :user_files
end

The problem I''m having is associating users all the way back through
user_files and disk_user_files to disks
Any help would be appreciated.

Jon


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