trustieforge/db/migrate/20151020013352_update_attachment.rb

class UpdateAttachment < ActiveRecord::Migration
  def up
    count = Attachment.all.count / 30 + 2
    transaction do
      for i in 1 ... count do i
      Attachment.page(i).per(30).each do |attachment|
        if attachment.container_type == 'Course'
          course = attachment.course
          if course
            if course.is_public == 0
              attachment.is_public = 0
              attachment.save
            end
          end
        end
      end
      end
    end
  end

  def down
  end
end