なるべく説明変数つかって分かりやすく書く
CSV.foreach(Rails.root.join('a', 'b', 'c', 'data.csv')) do |record|
path = Rails.root.join('db', 'b', 'c', filename='data.csv' ) CSV.foreach(path) do |record|
CSV.foreach(Rails.root.join('a', 'b', 'c', 'data.csv')) do |record|
path = Rails.root.join('db', 'b', 'c', filename='data.csv' ) CSV.foreach(path) do |record|