Ruby on rails Rails ActiveSupport存在通知状态gems问题

我在我的应用程序中安装了多个state_machine gems，用于通知系统，但每次遇到ActiveSupport问题时。它通常看起来与此几乎相同：

>> m = Message.new
TypeError: wrong argument type nil (expected Module)
        from /home/Ryan/appname/app/models/message.rb:2:in `include'
        from /home/Ryan/appname/app/models/message.rb:2
        from /home/Ryan/.bundle/ruby/1.8/gems/activesupport-2.3.9/lib/active_sup
port/dependencies.rb:406:in `load_without_new_constant_marking'
        from /home/Ryan/.bundle/ruby/1.8/gems/activesupport-2.3.9/lib/active_sup
port/dependencies.rb:406:in `load_file'
        from /home/Ryan/.bundle/ruby/1.8/gems/activesupport-2.3.9/lib/active_sup
port/dependencies.rb:547:in `new_constants_in'
        from /home/Ryan/.bundle/ruby/1.8/gems/activesupport-2.3.9/lib/active_sup
port/dependencies.rb:405:in `load_file'
        from /home/Ryan/.bundle/ruby/1.8/gems/activesupport-2.3.9/lib/active_sup
port/dependencies.rb:285:in `require_or_load'
        from /home/Ryan/.bundle/ruby/1.8/gems/activesupport-2.3.9/lib/active_sup
port/dependencies.rb:451:in `load_missing_constant'
        from /home/Ryan/.bundle/ruby/1.8/gems/activesupport-2.3.9/lib/active_sup
port/dependencies.rb:106:in `rake_original_const_missing'
        from /usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2503:in `const_m
issing'
        from /home/Ryan/.bundle/ruby/1.8/gems/activesupport-2.3.9/lib/active_sup
port/dependencies.rb:118:in `const_missing'
        from (irb):2

我在Windows7机器上使用activerecord、bundler安装gems和rails 2.3.9..我哪里出了问题？我需要对数据库进行一些修改吗

Edit: message.rb

    include AlterEgo # include this first
    include AlterEgo::ActiveRecordAdapter

    state :unread, :default => true do
      handle :state do
    "unread"
      end
      transition :to => :read, :on => :view!
    end

    state :read do
      handle :state do
    "read"
      end
    end

我不是很肯定，但我很难将其应用于activerecord。是否需要创建新数据库？

编辑

---

最后，我只是使用了oldschool acts作为状态机，因为这是一个非常简单的实现

我们需要更多的信息行您的答案类，其中出现错误编辑问题以包括message.rb（抱歉，忘记将其从答案更改为message！）…对于我尝试过的所有状态机（几乎所有的状态机）…这段代码都有几个变体…正如您所看到的，我对它的使用非常简单。