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Ruby on Jetsでターミナルにログを出力する方法

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ターミナルにLoggerを出力する方法

loggerが記載されている箇所を変更する。

config/application.rb
# config.logger = Jets::Logger.new($strerr)
config.logger = Jets::Logger.new($stdout)

loggerを出力する際はRuby on Railsのように、例えばlogger.debug ('hi')という記載をするのでは無く、Jets.logger.debug ('hi')のようにJetsを明言します。
これを記載しなければ、エラーが起こります。

posts_controller.rb
# GET /posts
  def index
    Jets.logger.debug ('log')
    p ('log')
    @posts = Post.all
    Jets.logger.debug (@posts.to_a)
  end

以下のようにログが出力されます。

app_1  | I, [2020-11-20T02:44:43.363645 #60]  INFO -- : Started GET "/posts" for 172.18.0.1 at 2020-11-20 02:44:43 +0000
app_1  | I, [2020-11-20T02:44:43.363994 #60]  INFO -- : Processing PostsController#index
app_1  | I, [2020-11-20T02:44:43.364474 #60]  INFO -- :   Event: { 省略 }
app_1  | I, [2020-11-20T02:44:43.364651 #60]  INFO -- :   Parameters: {}
app_1  | D, [2020-11-20T02:44:43.364999 #60] DEBUG -- : log
app_1  | "log"
app_1  | D, [2020-11-20T02:44:43.381540 #60] DEBUG -- : [#<Post id: 2, title: "create", created_at: "2020-11-20 01:39:31", updated_at: "2020-11-20 01:39:31">, #<Post id: 3, title: "test", created_at: "2020-11-20 01:43:45", updated_at: "2020-11-20 01:43:45">, #<Post id: 4, title: "post", created_at: "2020-11-20 01:43:53", updated_at: "2020-11-20 01:43:53">, #<Post id: 5, title: "new", created_at: "2020-11-20 02:31:57", updated_at: "2020-11-20 02:31:57">]

changelogを確認すると、1.5.2のリリースよりLoggerが利用できるようになったようです。

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