未定義的方法'角色？' 對於用戶

Question

我有以下abilities模型：

class Ability
  include CanCan::Ability

  def initialize(user)
    user ||= User.new # guest user, not logged in.

    if user.role? == :admin
      can :manage, :all
    else
      can :read, :all
      end
      if user.role == "default"
        can :create, Homescreen
        end
        can :destroy, Homescreen do |homescreen|
          homescreen.try(:user) == user
      end
  end
end

我有以下用戶模型：

class User < ActiveRecord::Base
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  before_create :setup_default_role_for_new_users


  attr_accessible :email, :password, :password_confirmation, :remember_me
  has_many :homescreens

  ROLES =%w[admin default]
  private
  def setup_default_role_for_new_users
    if self.role.blank?
      self.role = "default"
    end
  end
end

當我在我的本地機器上運行它時，它工作正常。

但是，當我部署到heroku時，我收到以下錯誤：

GET URL.herokuapp.com dyno=web.1 queue=0 wait=0ms service=158ms status=500 bytes=643
   app/models/ability.rb:7:in `initialize'
 NoMethodError (undefined method `role?' for #<User:0x00000003b56050>):

 cache: [GET /] miss

 Started GET "/" for my-ipaddress at 2012-03-19 16:14:38 +0000

 NoMethodError (undefined method `role?' for #<User:0x00000003df5d88>):
   app/models/ability.rb:7:in `initialize'

 cache: [GET /] miss

我究竟做錯了什么？

Answer 1

我使用以下命令重新啟動了heroku：

heroku restart && heroku ps:restart

它工作得很好。