polymorphic counter cache problem

klasses.rb

class Allen < ActiveRecord::Base
  has_many :joins, :as => :resource
  ...
end

class Bob < ActiveRecord::Base
  has_many :joins, :as => :resource
  ...
end

class Chris < ActiveRecord::Base
  has_many :joins, :as => :resource 
  ...
end

class Join < ActiveRecord::Base
  belongs_to :initiator, :class_name => "User", :foreign_key => "user_id"
             :counter_cache => ....
             
  belongs_to :resource, :polymorphic => true, :counter_cache => :resources_count
end

class User < ActiveRecord::Base
  has_many :joins
  has_many :allens, :through => :joins, :source => :initiator
  
  has_many :initial_joins, :class_name => "Join"
end