Rails - Mar 2006 - NameError when trying to combine Recipe 14 (rich HABTM) & Rec. 10 (self-ref HABTM):

Hi all,

I''m trying to model self-referential relations between people, where
the
relation has attached data.
     John ''works for'' Bob

Problem: '':through'' doesn''t work, and generates a
NameError.

=> the models :
     Person    (attr: name)
     Relation  (attr: source_id, target_id)
       (more details below)

ex: John ''works for'' Bob
1>   jsmith = Person.create(:name => ''John Smith'')
2>   jdoe   = Person.create(:name => ''John Doe'')
3>   jsmith.to_relations.create(:name => "works_for", :target
=> jdoe)
4>   assert_equal 1, jsmith.slaves.size
 >>>>
     NameError: activesupport/lib/active_support/dependencies.rb:106:in 
`const_missing'': uninitialized constant Slafe


Models
------------------------------------

   class Person < ActiveRecord::Base
       has_many    :to_relations  , :foreign_key =>
''source_id'',
:class_name => ''Relation''
       has_many    :slaves , :through => :to_relations   <<---- DOES
NOT
WORK !!!!!!!
   end


   #  id                  :integer(11)   not null
   #  source_id           :integer(11)
   #  target_id           :integer(11)
   #  name                :string(255)
   class Relation < ActiveRecord::Base
       belongs_to  :target ,  :foreign_key => ''target_id'',
:class_name
=> ''Person''
   end


Any idea?

Alain