require Rails.root.join("lib", "tasks", "task_helper") namespace :'2018_08_27_migrate_feedbacks' do task run: :environment do MAPPING = { 0 => Feedback.ratings.fetch(:unhappy), 1 => Feedback.ratings.fetch(:neutral), 2 => Feedback.ratings.fetch(:happy) } MAPPING.keys.each do |mark| rating = MAPPING[mark] Feedback .where(mark: mark) .update_all(rating: rating) end end end