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Railsで404 (Not Found)をログに残さないようにする方法

Last updated at Posted at 2018-06-02

config/routes.rbの末尾に以下を追加。

config/routes.rb
    # Not Foundのときログにスタックトレースを残さないようにするため
    # https://stackoverflow.com/a/39289253/5209556
    match '*any' => 'pages#not_found', via: [:get, :post]
app/controllers/pages_controller.rb
class PagesController < ApplicationController
  layout false

  # Not Foundだけ別ファイルにログを出す
  NotFoundLogger  = Logger.new(Rails.root.join("log/not_found.log"))

  # Not Foundのときログにスタックトレースを残さないようにするため
  # https://stackoverflow.com/a/39289253/5209556
  def not_found
    NotFoundLogger.error(request.fullpath)
    render file: 'public/404.html', status: :not_found, layout: nil
  end
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