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【Rails6】DEPRECATION WARNING: Rails 6.1 will return Content-Type header without modification. If you want just the MIME type, please use `#media_type` instead.

環境

  • Ruby: 2.6.3
  • Rails: 6.0.2.1

なんだこのWarning :thinking:

DEPRECATION WARNING: Rails 6.1 will return Content-Type header without modification. If you want just the MIME type, please use `#media_type` instead.

ActionDispatch::Response#content_type を呼ぶとこんなWarningが出ました。

  • Rails6.1からContent-Typeヘッダの値をそのまま返すよう変更するよ(これまではcharsetを除外してたけど含まれるようになるよ)
  • MIME typeだけが欲しい場合は ActionDispatch::Response#media_type を使ってね

と言われています。

欲しいのは text/html とか text/plain みたいなMIME typeでしたので、

ActionDispatch::Response#media_type へ修正してWarning解消しました。

参考

従来は、ActionDispatch::Response#content_typeの戻り値にcharsetパートが含まれていませんでした。 この振る舞いは変更され、従来省略されていたcharsetパートも含まれるようになりました。

MIMEタイプだけが欲しい場合は、代わりにActionDispatch::Response#media_typeをお使いください。

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