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【Rails】特定のメッセージlogのログレベルを変更する

Last updated at Posted at 2021-06-09

config/environment.rb にて以下を記述する。

require_relative 'application'
Rails.application.initialize!

class Logger
  class Formatter
    def call(severity, time, progname, msg)
      if msg.include?("No route matches")
        severity = "ERROR"
      end
      msg = msg.gsub(/^\n/, "")
    end
  end
end

解説

ここで出てきた引数の
msglogメッセージ
serverityログレベル

したがって上記の場合、「"No route matches" がメッセージに含まれるlogはERROR」
に変更される。

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