Rails - Feb 2008 - Complex form issue

I''m designing an application that has products and suppliers. Single
product has_many suppliers and each supplier has unique supplier code
for each product.

The form would facilitate something like
1. Select supplier from the list --> 2. Type the supplier code related
to supplier in the text field

The supplier codes can be added dynamically.

 #Product model
 class Product < ActiveRecord::Base
  has_many :supplier_codes
  has_many :suppliers, :through => :supplier_codes
 end

 #Supplier_code model
 class SupplierCode < ActiveRecord::Base
   belongs_to :product
   belongs_to :suppliers
 end

 #Supplier model
 class Supplier < ActiveRecord::Base
   has_many :supplier_codes
   has_many :products, :through => :supplier_codes
 end

The supplier_code table has these columns
product_id
supplier_id
code

I''m stuck with developing controller and form. trying out many things
but no success so far. Any help welcome.
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