core/app/services/spree/seeds/shipping_categories.rb
module Spree
module Seeds
class ShippingCategories
prepend Spree::ServiceModule::Base
def call
Spree::ShippingCategory.find_or_create_by!(name: I18n.t('spree.seed.shipping.categories.default'))
Spree::ShippingCategory.find_or_create_by!(name: I18n.t('spree.seed.shipping.categories.digital'))
end
end
end
end