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Devise 利用下の db:seed で "Could not find a valid mapping" エラー

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Rails に Devise を入れ、いろいろいじっている時に以下のエラーに遭遇。

$ docker-compose run web rake db:seed

Could not find a valid mapping for #<HogeHoge ~>

routes.rb に devise_for の指定がないといけない模様

Rails.application.routes.draw do
  # ...

  devise_for :hoge_hoges

  # ...
end

おしまい。

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