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ActiveRecord で find_each しながら map したい

Last updated at Posted at 2022-07-12

大きなデータを扱うときに使う find_each (doc) しながら値を集めたいとき

processed = []

User.where('age > 30').find_each do |user|
  # user に対するなんらかのバッチ処理
  ...

  processed << user.id
end

processed

みたいにやっていたけど、 find_eachEnumerator かえすので普通にメソッドチェーンを使えば良い気がする。

processed = User.where('age > 30').find_each.map do |user|
  # user に対するなんらかのバッチ処理
  ...

  user.id
end
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