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rails 本番環境のエラーをブラウザで表示する方法

結論

下記を変更するだけで本番環境でもブラウザ上でエラーを表示することが可能である。

//config/enviroments/production.rb
config.consider_all_requests_local = false 変更前
config.consider_all_requests_local = true 変更後

注意点

本番環境の詳細なエラー内容がユーザに見えてしまうのはよくないので、
エラー原因が特定できれば元に戻すのが良いかと思います。

開発環境ではエラーが存在する場合、ブラウザ上で表示してくれる。
しかし、本番環境ではproduction.rbのログを見たり、unicornやnginxのエラーログを見るくらいしか知らなかった。

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