socialforge/db/migrate/20170522020442_poll_question_migration.rb

class PollQuestionMigration < ActiveRecord::Migration
  def up
    pqs = PollQuestion.where(:question_type => 4)
    pqs.each do |pq|
      if pq.poll_answers.empty?
        pq.update_column("question_type", 3)
      end
    end
  end

  def down
  end
end