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Circular dependency detected while autoloading constant を防止する

Last updated at Posted at 2014-10-08

Capybara で Integration test を行う際にフロントエンド側で複数の Ajax リクエストが発行されるとテスト用に起動された Webrick がマルチスレッドで動いてしまい 同時に autolad_path にあるクラスやモジュール (e.g. concerns/*) の解決が行われてしまいエラーとなる場合がある

上記事象を避けるには以下の設定を追加する必要がある

config/environments/test.rb
  config.allow_concurrency = false

参考:
https://github.com/rails/rails/issues/15089#issuecomment-56104328
http://y-yagi.hatenablog.com/entry/2014/09/20/073819

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