鐵路圖生成器失敗，出現「NoMethodError」

對鐵路應用程序進行了一些修改後，我正在修補，鐵路停止工作。詳細輸出提供了一些線索。我想知道其他人是否遇到過這個問題，以及是否有解決這個問題的一些指針。這是一個數據建模錯誤？這是鐵路問題嗎？錯誤日誌如下...鐵路圖生成器失敗，出現「NoMethodError」

railroad -vM Loading application environment 
Loading application classes 
Generating models diagram 

...[snip]... 

    Processing Person 
     Processing model association authorships 
     Processing model association person_image 
     Processing model association publications 
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.2/lib/active_record/reflection.rb:224:in `derive_class_name': You have a nil object when you didn't expect it! (NoMethodError) 
The error occurred while evaluating nil.class_name 
    from /usr/lib/ruby/gems/1.8/gems/activerecord-2.1.2/lib/active_record/reflection.rb:106:in `class_name' 
    from /usr/lib/ruby/gems/1.8/gems/railroad-0.5.0/lib/railroad/models_diagram.rb:134:in `process_association' 
    from /usr/lib/ruby/gems/1.8/gems/railroad-0.5.0/lib/railroad/models_diagram.rb:102:in `process_class' 
    from /usr/lib/ruby/gems/1.8/gems/railroad-0.5.0/lib/railroad/models_diagram.rb:101:in `each' 
    from /usr/lib/ruby/gems/1.8/gems/railroad-0.5.0/lib/railroad/models_diagram.rb:101:in `process_class' 
    from /usr/lib/ruby/gems/1.8/gems/railroad-0.5.0/lib/railroad/models_diagram.rb:27:in `generate' 
    from /usr/lib/ruby/gems/1.8/gems/railroad-0.5.0/lib/railroad/models_diagram.rb:26:in `each' 
    from /usr/lib/ruby/gems/1.8/gems/railroad-0.5.0/lib/railroad/models_diagram.rb:26:in `generate' 
    from /usr/lib/ruby/gems/1.8/gems/railroad-0.5.0/bin/railroad:47 
    from /usr/bin/railroad:19:in `load' 
    from /usr/bin/railroad:19

來源

2008-12-29 speciousfool

看起來像Person類的問題，你可以發佈代碼嗎？ – 2008-12-29 12:10:19

我想說你有一個流浪「的has_many」或「belongs_to的」或在您的Person模型等協會電話...

我猜你的模型看起來是像

class Person 
    has_many :authorships 
    has_many :images 
    has_many :publications 
    has_many #with nothing after it 
    # the rest 
end

來源

2008-12-29 11:56:54 diclophis

你可能有一個的has_many：通過協會，正確指定，像

人的has_many：出版物：通過=> ...：源=> ...

請確保你的源代碼在那裏！

來源

2009-04-08 19:04:46 user88762

鐵路圖生成器失敗，出現「NoMethodError」

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