class RuboCop::Cop::Rails::ReadWriteAttribute

def on_send(node)
  return unless read_write_attribute?(node)
  add_offense(node.loc.selector, message: message(node)) do |corrector|
    case node.method_name
    when :read_attribute
      replacement = read_attribute_replacement(node)
    when :write_attribute
      replacement = write_attribute_replacement(node)
    end
    corrector.replace(node.source_range, replacement)
  end
end