# 私がやった対処等
①config/database.ymlのencoding:utf8mb4部分の修正
utf8mb4⇨utf8に変更
②（私はこの段階で既にrails db:createしていたためでまだ組み始めたばかりだったため）一旦、rails db:dropでデータベース消去
③
$ rails db:create
$ rails db:migrate
の順で復旧
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Mysql2::Error: Specified key was too long; max key length is 767 bytesに遭遇した
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