Rails/Active Record FAILSAFE錯誤「用戶無法引用」

Question

使用Rails 2.3.2（目前不能很好地升級）使用ruby 1.8.7（2009-06-12 patchlevel 174）[universal -darwin10.0。如果驗證是:on => :update，則在對模型進行驗證時嘗試保存時出現以下錯誤。如果我將驗證更改爲:on => :create並創建新記錄，則看不到該錯誤，並且如果沒有驗證，則保存它並沒有問題。

Completed in 392ms (View: 10, DB: 296) | 200 OK [http://localhost/barfoos/update] 
/!\ FAILSAFE /!\ Tue Sep 14 16:38:49 -0400 2010 
    Status: 500 Internal Server Error 
    User can't be referred 
    /path/to/project/vendor/rails/activerecord/lib/active_record/session_store.rb:67:in `dump' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/session_store.rb:67:in `marshal' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/session_store.rb:123:in `marshal_data!' 
    /path/to/project/vendor/rails/activesupport/lib/active_support/callbacks.rb:178:in `send' 
    /path/to/project/vendor/rails/activesupport/lib/active_support/callbacks.rb:178:in `evaluate_method' 
    /path/to/project/vendor/rails/activesupport/lib/active_support/callbacks.rb:166:in `call' 
    /path/to/project/vendor/rails/activesupport/lib/active_support/callbacks.rb:93:in `run' 
    /path/to/project/vendor/rails/activesupport/lib/active_support/callbacks.rb:92:in `each' 
    /path/to/project/vendor/rails/activesupport/lib/active_support/callbacks.rb:92:in `send' 
    /path/to/project/vendor/rails/activesupport/lib/active_support/callbacks.rb:92:in `run' 
    /path/to/project/vendor/rails/activesupport/lib/active_support/callbacks.rb:276:in `run_callbacks' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/callbacks.rb:344:in `callback' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/callbacks.rb:249:in `create_or_update' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/base.rb:2539:in `save_without_validation' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/validations.rb:1009:in `save_without_dirty' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/dirty.rb:79:in `save_without_transactions' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/transactions.rb:229:in `send' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/transactions.rb:229:in `with_transaction_returning_status' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb:136:in `transaction' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/transactions.rb:182:in `transaction' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/transactions.rb:228:in `with_transaction_returning_status' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/transactions.rb:196:in `save_without_unsaved_flag' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/transactions.rb:208:in `rollback_active_record_state!' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/transactions.rb:196:in `save_without_unsaved_flag' 
    /path/to/project/vendor/plugins/active_scaffold/lib/extensions/unsaved_record.rb:15:in `save' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/session_store.rb:300:in `set_session' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/base.rb:1453:in `silence' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/session_store.rb:297:in `set_session' 
    /path/to/project/vendor/rails/actionpack/lib/action_controller/session/abstract_store.rb:132:in `call' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/query_cache.rb:29:in `call' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb:34:in `cache' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/query_cache.rb:9:in `cache' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/query_cache.rb:28:in `call' 
    /path/to/project/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:361:in `call' 
    /path/to/project/vendor/rails/actionpack/lib/action_controller/reloader.rb:9:in `call' 
    /path/to/project/vendor/rails/actionpack/lib/action_controller/failsafe.rb:11:in `call' 
    /Library/Ruby/Gems/1.8/gems/rack-1.0.1/lib/rack/lock.rb:11:in `call' 
    /Library/Ruby/Gems/1.8/gems/rack-1.0.1/lib/rack/lock.rb:11:in `synchronize' 
    /Library/Ruby/Gems/1.8/gems/rack-1.0.1/lib/rack/lock.rb:11:in `call' 
    /path/to/project/vendor/rails/actionpack/lib/action_controller/dispatcher.rb:106:in `call' 
    /path/to/project/vendor/rails/railties/lib/rails/rack/static.rb:31:in `call' 
    /Library/Ruby/Gems/1.8/gems/rack-1.0.1/lib/rack/urlmap.rb:46:in `call' 
    /Library/Ruby/Gems/1.8/gems/rack-1.0.1/lib/rack/urlmap.rb:40:in `each' 
    /Library/Ruby/Gems/1.8/gems/rack-1.0.1/lib/rack/urlmap.rb:40:in `call' 
    /path/to/project/vendor/rails/railties/lib/rails/rack/log_tailer.rb:17:in `call' 
    /Library/Ruby/Gems/1.8/gems/rack-1.0.1/lib/rack/content_length.rb:13:in `call' 
    /Library/Ruby/Gems/1.8/gems/rack-1.0.1/lib/rack/handler/webrick.rb:50:in `service' 
    /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/httpserver.rb:104:in `service' 
    /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/httpserver.rb:65:in `run' 
    /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread' 
    /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:162:in `start' 
    /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread' 
    /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:95:in `start' 
    /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:92:in `each' 
    /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:92:in `start' 
    /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:23:in `start' 
    /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:82:in `start' 
    /Library/Ruby/Gems/1.8/gems/rack-1.0.1/lib/rack/handler/webrick.rb:14:in `run' 
    /path/to/project/vendor/rails/railties/lib/commands/server.rb:111 
    /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require' 
    /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require' 
    script/server:3 

這個模型看起來是這樣的：

class Barfoo < ActiveRecord::Base 
    default_scope :conditions => {:scoping_model_id => ScopingModel.current_version.id} 
    belongs_to :scoping_model 

    # validate is false to keep from attempting to validate Foobar on Barfoo save, as Foobar can be saved, even if invalid, unlike Barfoo. 
    has_one :foobar, :validate => false 
    validates_presence_of :foobar_id, :on => :create, :message => "can't be blank" 
    validates_inclusion_of :accepted_an_agreement, :in => [true, false], :on => :update, :message => "please choose whether you agree or disagree" 
    validates_presence_of :some_option_string, :on => :update, :message => "before agreeing, you must specify the some string", :if => Proc.new { |detail| detail.accepted_an_agreement == true } 
    validates_presence_of :some_text, :on => :update, :message => "you must provide details if option is 'Other'", :if => Proc.new { |detail| detail.some_option_string == 'Other' } 
end 

我指定爲這些字段的值並不重要，並且在下面他的評論Shadwell筆記，這似乎是會話相關的。我們在ApplicationController中執行的會話相關和用戶相關的一件事可能會導致此問題，即使它現在從來沒有成爲問題。 ApplicationController的樣子：

class ApplicationController < ActionController::Base 
    include ExceptionNotifiable 
    require 'something_that_defines_update_method_that_we_redefine_in_controller' 
    include Userstamp 

    ActionController::Base.session_options[:httponly] = true 
    ActionController::Base.session_options[:secure] = true 

    prepend_before_filter :user_setting_method 

    ... 

    protected 

    def user_setting_method 
    session[:username] ||= optional_override_username 
    session[:username] = session[:username] # touch the session for timeout purposes 
    @user ||= User.find_by_username session[:username] 
    true 
    end 

    ... 

end 

搜索並沒有帶來太多了約/!\ FAILSAFE /!\與User can't be referred。任何關於什麼會導致這種情況的想法，有沒有常見的解決方案來尋找這個或那些可能是錯誤的？

請注意，附加到此的foobar實例已保存，但在此特定情況下，foobar之前很久以前已保存過，但未驗證（保存未經驗證，這是正常的可能狀態，因爲它是數據從部分保存數據的多頁形式，用戶可以返回並在稍後修正完成）。

Answer 1

繼續開發模型後多一點我開始另一個錯誤：

/!\ FAILSAFE /!\ Fri Sep 17 14:53:50 -0400 2010 
    Status: 500 Internal Server Error 
    can't dump hash with default proc 

我試圖保存在控制檯中的模式和成功，但看到了一些奇怪的事情。當我已經在模型上設置了有效的foobar時，它要求foobar_id有效（例如）。所以，我和一個團隊成員談論了這件事，並且聽說他已經閱讀了關於試圖驗證這樣的關聯對象的id的問題。

我刪除：

validates_presence_of :foobar_id, :on => :create, :message => "can't be blank" 

和它的工作。

但是，它是由另一同事，我是有這個問題，很可能涉及到做validates_presence_of :foobar_id的時候，在控制器中，我試圖設置foobar向我建議：

barfoo.foobar = foobar 

，而不是設置foobar_id，如：

barfoor.foobar_id = foobar.id 

我也注意到，與前例子，它沒有在數據庫中的相關行中設置foobar_id。

將它更改爲foobar_id設置爲barfoo後，只要沒有更新驗證，它就會保存在創建和更新中。但是，如果我添加驗證:on => :update，它會失敗。

Answer 2

我在這裏很晚。但我也有同樣的問題，我得到了一個臨時的解決辦法爲它

只是覆蓋在activerecord/lib/active_record/session_store.rb

ActiveRecord::SessionStore::ClassMethods.module_eval do 
    def marshal(data) 
    # To prevent from Marshal dump error 
    begin  
     ::Base64.encode64(Marshal.dump(data)) if data 
    rescue  
     # Checks for any ActiveRecord object in session variables and reloads it 
     data.each_pair do |key,obj| 
     if obj.is_a?(ActiveRecord::Base) || obj.is_a?(Array) 
      unless obj.is_a?(Array)  
      data[key] = obj.reload    
      next         
      end       
      data[key].collect do |it_obj| 
      if obj.is_a?(ActiveRecord::Base)  
       it_obj.reload        
      else         
       it_obj          
      end         
      end       
     end      
     end    
     ::Base64.encode64(Marshal.dump(data)) if data 
    end   

    end 
end 

名帥方法簡單，它會重新加載所有的ActiveRecord對象存在於會話變量