class RuboCop::Cop::Rails::RequestReferer

def autocorrect(node)
  ->(corrector) { corrector.replace(node, "request.#{style}") }
end

def message
  "Use `request.#{style}` instead of `request.#{wrong_method_name}`."
end

def on_send(node)
  referer?(node) do |method_name|
    return unless method_name == wrong_method_name
    add_offense(node.source_range, node.source_range, message)
  end
end

def wrong_method_name
  style == :referer ? :referrer : :referer
end