module ActiveRecord::ReadonlyAttributes::HasReadonlyAttributes

def _write_attribute(attr_name, value)
  if !new_record? && self.class.readonly_attribute?(attr_name.to_s)
    raise ReadonlyAttributeError.new(attr_name)
  end
  super
end

def write_attribute(attr_name, value)
  if !new_record? && self.class.readonly_attribute?(attr_name.to_s)
    raise ReadonlyAttributeError.new(attr_name)
  end
  super
end