class <%= migration_class_name %> < ActiveRecord::Migration
  def self.up
    change_table :<%= table_name %> do |t|
<% attachment_names.each do |attachment| -%>
      t.attachment :<%= attachment %>
<% end -%>
    end
  end

  def self.down
<% attachment_names.each do |attachment| -%>
    remove_attachment :<%= table_name %>, :<%= attachment %>
<% end -%>
  end
end