Rails - Feb 2006 - habtm and counter (xxx_count field in DB)

Hi all

I have the following models:

class Member < ActiveRecord::Base
  # DJ Profiles the member is part of
  has_and_belongs_to_many :disc_jockeys,
                          :join_table =>
''members_are_disc_jockeys'',
                          :uniq => true
end

class DiscJockey < ActiveRecord::Base
  # Members that are part of this DJ profile
  has_and_belongs_to_many :members,
                          :join_table =>
''members_are_disc_jockeys'',
                          :uniq => true
end

I tried to add such a xxx_count field to have a counter cache, so I 
added the field disc_jockeys_count to the members table. But sadly this 
doesn''t become updated when adding a DJ object to a member...

What''s wrong? Thanks.
Josh

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