20110811124516_migrate_product_type_category_groups.rb

    ProductType.all.each do |product_type|
      # Check if product type has banyan category group
      product_type_group = product_type.category_group
      
      # Create banyan category group for product type if not exist
      if product_type_group.nil?
        product_type_group = Banyan::CategoryGroup.new(:name => product_type.name + " Category Group")
        product_type_group.group_categorizable = product_type
        product_type_group.save!
      end
      
      # Assign categories
      product_type.product_type_categories.each do |product_type_category|
        # Find or create - two steps because 3.0.4 has some problems with find_or_create_by_name
        category = Banyan::Category.find_by_name(product_type_category.name)
        category ||= Banyan::Category.create(:name => product_type_category.name)
        
        product_type_group.categories << category unless product_type_group.category_ids.include?(category.id)
      end
    end