plugins/delivery/models/delivery_plugin/option.rb
class DeliveryPlugin::Option < ApplicationRecord
belongs_to :delivery_method, class_name: "DeliveryPlugin::Method", optional: true
belongs_to :owner, polymorphic: true, optional: true
validates_presence_of :delivery_method
validates_presence_of :owner
attr_accessible :owner_id, :owner_type, :delivery_methods, :delivery_method
end