はじめてのRuby！to_iメソッドで文字列を整数に変換する | 侍エンジニアブログ
Using group throws undefined method `to_i' for {1=>1, 14=>1}:Hash Did you mean? to_s · Issue #2041 · rmosolgo/graphql-ruby · GitHub
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Ruby】to_iメソッドで値を整数に変換する。 #Ruby - Qiita
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