class WolfCore::DomainObject

def self.define_attributes(*attributes)
  self.fields += attributes
  attr_accessor(*attributes)
  define_attribute_methods(*attributes)
  attributes.each do |attribute|
    define_method(:"#{attribute}=") do |value|
      send(:"#{attribute}_will_change!") unless value == send(attribute)
      run_callbacks :attribute_change do
        instance_variable_set(:"@#{attribute}", value)
      end
      value
    end
  end
end