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RailsのActiveRecordにおける、日付期間の重複チェック

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参考によると

比較開始日付 <= 対象終了日付 AND 比較終了日付 >= 対象開始日付

で重なっていると判断されるらしいので

matched_dates = Hoge.where('start <= ? and end >= ?', self.start, self.end)

みたいな感じにすればよい

参考:
https://qiita.com/yaju/items/a58a78f41ee41258a5fe

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