ActiveController roles

admin_controllerb.rb

class Admin::AdminController < Admin::ApplicationController
  role 'Admin'
end

applpication_controller.rb

class Admin::ApplicationController < ApplicationController
  include Roleable

  # Devise
  before_filter :authenticate_user!
end

rolable.rb

# encoding: UTF-8
module Roleable
  extend ActiveSupport::Concern

  included do
    class_eval do
      cattr_accessor :admin_role
      before_filter :check_for_role
    end
  end

  def check_for_role
    if current_user.in_role?(self.class.admin_role)
      return true
    else
      redirect_to admin_dashboard_path, :notice => 'Nemáte oprávnění'
    end
  end

  module ClassMethods
    def role(role)
      self.admin_role = role
    end
  end
end

user.rb

class User
  def in_role?(role)
    return true if self.role == 'Admin'
    return true if role == nil
    return self.role == role
  end
end