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rails APIモード+ActiveAdminで、管理者画面にてユーザーを削除しようとしたらNo route matchesのエラーが発生した際の対処法

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環境

  • Rails 5.2.3 (APIモード)
  • activeadmin (2.3.1)

事象

管理者画面(http://localhost:3000/admin/) にて、管理者を削除するボタンを押したところ、Routing Error No route matches [POST] "/admin/admin_users/2"が発生する。

原因

HTTPのPUTメソッド、DELETEメソッドを実現するためのミドルウェアであるRack::MethodOverrideが使用されていなかったため。

対応

  1. rake middlewareコマンドを実行し、Rack::MethodOverrideがないことを確認
  2. application.rbにconfig.middleware.use Rack::MethodOverrideを追加
class Application < Rails::Application
  (中略)
   config.middleware.use Rack::MethodOverride

参考

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