class RuboCop::Cop::Rails::RenderPlainText

def on_send(node)
  render_plain_text?(node) do |options_node, option_node, option_value|
    content_type_node = find_content_type(options_node)
    return unless compatible_content_type?(content_type_node)
    add_offense(node) do |corrector|
      rest_options = options_node.pairs - [option_node, content_type_node].compact
      corrector.replace(node, replacement(rest_options, option_value))
    end
  end
end