ruby-on-rails - 将 Rails 应用程序部署到 Heroku 无法正常工作

Question

我已经在 Nitrous.io 上使用 Active Admin 创建了一个 rails 应用程序，并且一切都在该开发环境中工作。我正在使用 Devise/CanCanCan 进行身份验证/授权

当我推送到 heroku 并尝试访问 Active Admin 时，我收到以下错误：

Started GET "/admin" for 91.226.23.198 at 2014-09-06 21:15:49 +0000                                                                                                                                                            
Processing by Admin::ProductsController#index as HTML                                                                                                                                                                          
NoMethodError (undefined method `include?' for nil:NilClass):                                                                                                                                                                  
app/models/user.rb:8:in `role?'                                                                                                                                                                                              
app/models/ability.rb:6:in `initialize'   

我的用户模型是这样的：

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, 
         :recoverable, :rememberable, :trackable, :validatable

  def role?(r)
      role.include? r.to_s
    end
end

能力.rb

class Ability
  include CanCan::Ability

  def initialize(user)
    user ||= User.new # guest user (not logged in)
      if user.role? :administrator
        can :manage, :all
      elsif user.role? :moderator
          can :manage, Product
          can :manage, User, :id => user.id
              cannot :destroy, User
          #can :read, ActiveAdmin::Page, :name => "Dashboard"
          can :read, ActiveAdmin::Page, :name => "Contact Us"
          can :read, ActiveAdmin::Page, :name => "About x"
          can :read, ActiveAdmin::Page, :name => "FAQ"
          #can :manage, [Page, Unit, Category, News]
    else
        can :read, Product
        can :manage, User, :id => user.id
            cannot :destroy, User
        #can :read, ActiveAdmin::Page, :name => "Dashboard"
        can :read, ActiveAdmin::Page, :name => "Contact Us"
        can :read, ActiveAdmin::Page, :name => "About x"
        can :read, ActiveAdmin::Page, :name => "FAQ"
    end
end
end

我究竟做错了什么？

我试过多次重启heroku服务器。

谢谢你们的帮助。

干杯!

Answer 1

好的，终于找到了解决方案。问题是 Active Admin 创建的默认用户不包含角色，因此我使用角色 = 'administrator' 为用户播种，并且能够使用该用户登录并且一切正常。

感谢所有的帮助。