core/app/models/spree/store_product.rb
module Spree
class StoreProduct < Spree::Base
self.table_name = 'spree_products_stores'
belongs_to :store, class_name: 'Spree::Store', touch: true
belongs_to :product, class_name: 'Spree::Product', touch: true
validates :store, :product, presence: true
validates :store_id, uniqueness: { scope: :product_id }
end
end