file1

class AdminController < ApplicationController
  rescue_from Acl9::AccessDenied, with: :unauthorized_redirect

  before_filter :require_user

  access_control do
    allow :admin
  end

  def show
    @plans = PlansPresenter.new(Plan.all)
  end

  private

  def unauthorized_redirect
    flash[:error] = I18n.t('login.unauthorized')
    redirect_to login_path
  end

end

file2

class Plan < ActiveRecord::Base
  attr_accessible :name, :amount, as: :admin

  def self.free
    Plan.where(name: 'free').first_or_create!
  end
end

file3

rails c
Plan.create!(name: 'Blah')