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[WIP/初学者]flashとflash.nowの使い分け

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flash[:notice]

  • redirect_toを使う場合に設定
    • 次のリクエストまで有効なメッセージを設定したい場面で使用。
    • 次のリクエストが終了した時点で、自動的にメッセージは削除。
    • redirect_toした先の画面でメッセージを表示したい場合に用いる。

flash.now[:notice]

  • renderを使う場合に設定
    • 現在のリクエストでのみ有効なメッセージを設定する。
    • 現在のリクエストが終了した時点で、自動的にメッセージは削除される。
    • renderでflash[:notice]を設定すると、画面遷移後のページにも表示される
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