socialforge/db/migrate/20150911064528_alter_user_activities.rb

class AlterUserActivities < ActiveRecord::Migration
  def up
    UserActivity.all.each do |activity|
      if activity.act_type == 'Message'
        if activity.act
          unless activity.act.parent_id.nil?
            parent_act = UserActivity.where("act_id = #{activity.act.parent.id} and act_type='Message'").first
            parent_act.created_at = activity.act.parent.children.maximum("created_on")
            parent_act.save
            activity.destroy
          end
        else
          activity.destroy
        end
      end
    end
  end

  def down
  end
end