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@hiyashikyuri(Masahiro Okubo)

railsで子モデルをcreated_at descで取得するscope

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子モデルのデータをdescやascで取得方法を変えるには下記の方法でいけます

scope :order_asc, -> { includes(:messages).order('messages.created_at ASC') }

参考記事

Ruby On Rails: Order by child attribute

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