Rails core - May 2013 - Rev 3.2.13 has_one relation with :foreign_key set to a method

Hey,
 I found in the documentation about has_one
*":primary_key Specify the method that returns the primary key used for the
association. By default this is id."*

My interpretation is that when I have a method in the model, I can point 
:foreign_key to this method

  has_one :participants_group, :class_name => 
"Group::Virtual::Participants",
          :foreign_key => :id,
          :primary_key => :participants_group_id,
          :dependent => :destroy,
          :inverse_of => :topic

private

def participant_group_id

# the result of this method should be taken as a foreign_key value in the 
query.

# IMHO Query should be: SELECT "groups".* FROM "groups"
WHERE
"groups"."type" IN
(''Group::Virtual::Participants'') AND
"groups"."id" = 1
LIMIT 1 

1

end

Instead the query is

SELECT "groups".* FROM "groups" WHERE
"groups"."type" IN
(''Group::Virtual::Participants'') AND
"groups"."id"* IS NULL *LIMIT 1


In ActiveRecord::Associations::AssociationScope#add_constraints line 70 
there is

scope = scope.where(table[key].eq(*owner[foreign_key]*))

Which I think is wrong according to the documentation, because it just 
accesses attributes

To match the documentations iit shoud rather be 

scope = scope.where(table[key].eq(*owner.send foreign_key*))

Please tell me which should be true Documentation or Code, and please 
either change the line, or the documentation.


Thanks Martin.

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