module ActiveFedora::AttributeMethods::Write

def attribute=(attribute_name, value)
  write_attribute(attribute_name, value)
end

def write_attribute(attribute_name, value)
  if self.class.properties.key?(attribute_name)
    @attributes[attribute_name] = value
  else
    raise ActiveModel::MissingAttributeError, "can't write unknown attribute `#{attribute_name}'"
  end
end