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カラムのBoolean型とは

Posted at

Booleanとは、一般的に真と偽のような2つの状態を表すデータ型のこと

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Railsではbooleanにデフォルト値を渡してあげることによって、
true,false,nilという3つの情報を必ず2つに収束するようにできる
nilというものが存在しないようにチェックすることができる。

なので必ずデフォルト値を入れてあげるとよい。

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