Rails - Jul 2008 - habtm many-to-many relationship problem attribute_methods.rb

Hi,

I have a many-to-many relationship between:  registrations and groups
(properly setup on each side with has_and_belongs_to_many)

so I do this in the console:

reg = Registration.find(:first)
grp = Group.find(:first)

grp.registrations  list me the registrations'' attributes linked with
the group in question

reg.groups returns me:

NoMethodError: undefined method `groups'' for
#<Registration:0x3164718>
        from /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/
active_record/attribute_methods.rb:256:in `method_missing''
        from (irb):XX

where XX started around 10 I think and kept augmenting each time I ran
"reg.groups"


I can''t figure out what is happening to get this message...
registrations and groups are identically setup to what I can see...


thanks if anyone can bring me any clue!

PS. I''m using restful_authentication and restful_acl, but it
shouldn''t
give any problem here...

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Actually, some model names are in french so I translated, so it could
make more sens ...  but registration is inscription and groups are
periodes in the above example...

some code in the models are temporary, just so that I can debug more
easily.
Here are models and migrations

#########################################
class Inscription < ActiveRecord::Base

  has_and_belongs_to_many :periodes
  belongs_to :user

#restful_acl part - supposed to work fine###############
  def is_updatable_by(user)
      current_user.is_admin?
  end

  def is_deletable_by(user)
    current_user.is_admin?
  end

  def self.is_readable_by(user, object = nil)
     true
     #current_user.is_admin?
  end

  def self.is_creatable_by(user)
     current_user.is_admin?
     #user != nil #Ensure the user is logged in

  end

end


######################################
class Periode < ActiveRecord::Base


  has_and_belongs_to_many :inscriptions

  belongs_to :course
  belongs_to :prof



  def is_updatable_by(user)
    current_user.is_admin?
  end

  def is_deletable_by(user)
    current_user.is_admin?
  end

  def self.is_readable_by(user, object = nil)
     true
     #user != nil #Ensure the user is logged in
  end

  def self.is_creatable_by(user)
     current_user.is_admin?
     #user != nil #Ensure the user is logged in

  end


end


other models
##########
user   has_many :inscriptions
prof has_many :periodes
course has_many :periodes



##############################################
MIGRATIONS
#############################################

class CreatePeriodes < ActiveRecord::Migration
  def self.up
    create_table :periodes do |t|
      t.integer :course_id
      t.integer :prof_id

      t.timestamps
    end
  end

  def self.down
    drop_table :periodes
  end
end

#################
class CreateInscriptionsPeriodes < ActiveRecord::Migration
  def self.up
    create_table :inscriptions_periodes, :id => false do |t|
      t.integer :inscription_id
      t.integer :periode_id

      t.timestamps
    end

    #add_index :inscriptions_periodes, [:inscription_id, :periode_id]

  end

  def self.down
    drop_table :inscriptions_periodes
  end
end


#####
class CreateInscriptions < ActiveRecord::Migration
  def self.up
    create_table :inscriptions do |t|
      t.integer :user_id

      t.timestamps
    end
  end

  def self.down
    drop_table :inscriptions
  end
end
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