gitlabhq/db/migrate/20130218141258_convert_closed_to_state_in_issue.rb

class ConvertClosedToStateInIssue < ActiveRecord::Migration
  def up
    Issue.transaction do
      Issue.where(closed: true).update_all(state: :closed)
      Issue.where(closed: false).update_all(state: :opened)
    end
  end

  def down
    Issue.transaction do
      Issue.where(state: :closed).update_all(closed: true)
    end
  end
end