class RuboCop::Cop::Rails::ReadWriteAttribute

def message(node)
  _receiver, method_name, *_args = *node
  if method_name == :read_attribute
    format(MSG, 'self[:attr]', 'read_attribute(:attr)')
  else
    format(MSG, 'self[:attr] = val', 'write_attribute(:attr, val)')
  end
end