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[Rails]logフォーマットを自分好みに変更する

Rails

Last updated at 2020-06-19Posted at 2020-06-19

前提

ruby: 2.7.1
Rails: 6.0.3

自分好みの Formatter を定義する

config/logger_my_formatter.rb

class Logger
  class MyFormatter < Formatter
    def call(severity, time, progname, msg)
      "[%s#%d] %5s -- %s: %s\n" % [format_datetime(time), $$, severity, progname, msg]
    end
  end
end

自分好みの Formatter を指定する

config/application.rb

require_relative 'boot'
require_relative 'logger_my_formatter' # 追記

# ...

動作確認は production モードで行います(developmentモードはActiveSupport::Logger::SimpleFormatter)。

config/environments/production.rb

Rails.application.configure do
  # ...
  config.log_formatter = ::Logger::MyFormatter.new # 追記
end

動作確認

デフォルト

I, [2020-06-19T16:16:21.592424 #4688]  INFO -- : [e8b5388b-e8d9-4a31-a350-1f3cafdd0dda] Completed 200 OK in 224ms (Views: 102.2ms | ActiveRecord: 40.3ms | Allocations: 65613)

変更後

[2020-06-19T16:21:53.497691 #5177]  INFO -- : [d8ef0edd-4d3b-4618-bba7-050a185fa30b] Completed 200 OK in 12ms (Views: 6.3ms | ActiveRecord: 2.5ms | Allocations: 5132)

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