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webmockのgem使用時にhashdiffの警告ログが吐かれる

Last updated at Posted at 2021-10-08

環境情報

  • Ruby 2.6.1
  • Rails 5.2.6

起きたこと

webmockのgemを使用しているRailsプロジェクトを rails s などで立ち上げた際、下記ログが吐き出される

The HashDiff constant used by this gem conflicts with another gem of a similar name.  As of version 1.0 the HashDiff constant will be completely removed and replaced by Hashdiff.  For more information see https://github.com/liufengyun/hashdiff/issues/45.

解決方法

ログの内容にもあるように、hashdiffを1.0.0以上に更新する
ただ、webmockの最新(3.14.0)でもhashdiffの最低バージョンは0.4.0になっていたため、Gemfileに追記する

gem "hashdiff", ">= 1.0.0"

その後、 bundle update hashdiff でgemを更新すれば解消されます

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