CanCan + Devise：管理员用户无法获得权限，即使他应该

Question

以下是代码。

class WebsitesController < ApplicationController 
    load_and_authorize_resource 

    ... 
end 

class ApplicationController < ActionController::Base 
    ... 

    check_authorization :unless => :do_not_check_authorization? 

    private 
    def do_not_check_authorization? 
     respond_to?(:devise_controller?) 
    end 
end 

class Ability 
    include CanCan::Ability 

    def initialize(user) 
    user ||= User.new 
    if user.role? == "admin" 
     can :manage, :all 
    elsif user.role? == "developer" 
     can :manage, :websites 
     can :manage, :pages 
     can :manage, :templates 
    elsif user.role? == "editor" 
     can :manage, :pages 
    end 
    end 
end 

从它的外观，具有管理员角色的用户应该能够因为can :manage, :all网站负责人做任何事情。

但是，当我打的网站/指数，我得到

CanCan::AccessDenied in WebsitesController#index 

You are not authorized to access this page. 

这究竟是为什么？

Answer 1

我很笨。

I user.role?返回true但是true == "admin"总是错误的。