search for: product_identification_product_code

...the mailing list and on the web but I can''t seem to find the answer to this, but it''s pretty much a noob question. I have a Product object class Product < ActiveRecord::Base has_many :product_identifications has_one :product_identification_item_number has_one :product_identification_product_code end the product_identifications is using STI to have the two optional product identifiers Item Number and Product Code. I would like to use this on a listing screen but use :include to keep it at only one query, however when i add ":include => :product_identification_item_number&quo...