何回も忘れるのでメモ。
原因
Gemfile内にmysql2を書いてない。
解決法
ターミナルで下記を打ち込む。
$ bundle config --local build.mysql2 "--with-ldflags=-L/usr/local/opt/openssl/lib"
Gemfileに下記をかいて、bundle installする。
gem 'mysql2', '~>0.5.3'
なぐり書き
More than 3 years have passed since last update.
エラーAn error occurred while installing mysql2 (0.5.3), and Bundler cannot continue. Make sure that `gem install mysql2 -v '0.5.3' --source 'https://rubygems.org/'` succeeds before bundling.の解決方法
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