Rails - Sep 2006 - deleting an item from a polymorphic association

Hi,
   I am learning RoR and in the process of implmenting a solution I have 
run into a problem.

My basic setup:

  each customer and sales order could have more than one address, say 
''billing'', ''shipping'' and may be more.

  create_table "addresses", :force => true do |t|
    t.column "address_kind", :string, :limit => 60
    t.column "addressable_id", :integer, :default => 0
    t.column "addressable_type", :string, :limit => 120
    ...
  end

  create_table "customers", :force => true do |t|
    t.column "company_name", :string, :limit => 200
    ...
  end

  create_table "sales_orders", :force => true do |t|
    t.column "customer_id", :integer, :default => 0, :null =>
false
    ...
  end

class Address < ActiveRecord::Base
  belongs_to :addressable, :polymorphic => true
  ...
end

class Customer < ActiveRecord::Base
  has_many :addresses, :as => :addressable
# has_many :addresses, :as => :addressable, :before_remove => 
:clean_up_address

  def billing_address
    addresses.find_by_address_kind ''billing'' unless
addresses.empty?
  end

  def shipping_address
    addresses.find_by_address_kind ''shipping'' unless
addresses.empty?
  end

  def billing_address=(address)
    addresses.delete(billing_address) if billing_address
    address.address_kind = ''billing''
    addresses << address
  end

  def shipping_address=(address)
    addresses.delete(shipping_address) if shipping_address
    address.address_kind = ''shipping''
    addresses << address
  end

  def clean_up_address(address)
    write_attribute(:address_kind, nil)
    write_attribute(:addressable_type, nil)
    # address.address_kind = nil
    # address.addressable_type = nil
  end
end

class SalesOrder < ActiveRecord::Base
  has_many :addresses, :as => :addressable
  ... (address related methods similar to customer)
end

   I am running into a problem while reassigning, say, a new billing 
address to a customer. The addresses.delete(billing_address) in the 
billing_address= method updates only the addressable_id to NULL in the 
database. I tried to add :before_remove option to the has_many and 
implemented the clean_up method. Even then, only the addressable_id is 
updated to NULL and not address_kind or addressable_type.

   Is this correct approach? And if not, what is the correct approach to 
follow while reassigning a new address either to a customer or sales 
order?

   Your assistance is greatly appreciated.

Thanks

suresh

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