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Rails フォロータグを集計したい☺️

やりたいこと

タイトルの通り☺️

データ構造

follow_tagsテーブル: ユーザーがフォローしているタグを判断するテーブル

id user_id tag_id
ID ユーザーID タグID

コード

popular_tags = FollowTag.group(:tag_id).order('count_tag_id desc').count(:tag_id)
popular_tags.class
=> Hash

これで、降順にハッシュ化された結果{ id=>count }が返ってくる。

最初の10件のkeyだけ欲しいので、

popular_tags = FollowTag.group(:tag_id).order('count_tag_id desc').count(:tag_id).keys.shift(10)
=> [59, 7, 9, 16, 57, 47, 49, 21, 50, 27]

こんな感じでどうでしょうか??

参考資料

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