Tag: 堆栈溢出

Ruby 1.9.2中机架级的SystemStackError，而不是1.8.7: 我被引入遗留代码库，将它从Rails 2.4 / Ruby 1.8.7升级到Rails 3.1 / Ruby 1.9.2。在这样做的过程中，我发现了一个非常有趣的问题，需要花费3天才能弄明白。我想把它放在这里，为其他人看到问题给它一些谷歌果汁，并提出问题：为什么？基本上，我在运行我的应用程序时在Rack级别看到了SystemStackError 。在错误发生之前我无法获得任何请求，并且因为我的代码从未被触及而无法调试它。在开发模式下，我可以看到很多站点，然后在数据库被命中时突然得到SystemStackError 。所以我认为这是一种懒惰加载。切换到生产模式，第一个请求发生exception。服务器正常启动，但没有请求通过，我的代码没有被触及。快进太多小时，我跟踪回溯到Rails中的循环（完整要点）： /Users/john/.rvm/gems/ruby-1.9.2-p320@qstream-ruby19/gems/actionpack-3.1.6/lib/action_dispatch/routing/url_for.rb:102:in `initialize’ /Users/john/.rvm/gems/ruby-1.9.2-p320@qstream-ruby19/gems/actionpack-3.1.6/lib/action_controller/metal.rb:140:in `initialize’ /Users/john/.rvm/gems/ruby-1.9.2-p320@qstream-ruby19/gems/actionpack-3.1.6/lib/abstract_controller/rendering.rb:74:in `initialize’ /Users/john/.rvm/gems/ruby-1.9.2-p320@qstream-ruby19/gems/actionpack-3.1.6/lib/abstract_controller/layouts.rb:301:in `initialize’ /Users/john/.rvm/gems/ruby-1.9.2-p320@qstream-ruby19/gems/actionpack-3.1.6/lib/action_dispatch/routing/url_for.rb:103:in `initialize’ /Users/john/.rvm/gems/ruby-1.9.2-p320@qstream-ruby19/gems/actionpack-3.1.6/lib/action_controller/metal.rb:140:in `initialize’ /Users/john/.rvm/gems/ruby-1.9.2-p320@qstream-ruby19/gems/actionpack-3.1.6/lib/abstract_controller/rendering.rb:74:in `initialize’ /Users/john/.rvm/gems/ruby-1.9.2-p320@qstream-ruby19/gems/actionpack-3.1.6/lib/abstract_controller/layouts.rb:301:in `initialize’ /Users/john/.rvm/gems/ruby-1.9.2-p320@qstream-ruby19/gems/actionpack-3.1.6/lib/action_dispatch/routing/url_for.rb:103:in `initialize’ /Users/john/.rvm/gems/ruby-1.9.2-p320@qstream-ruby19/gems/actionpack-3.1.6/lib/action_controller/metal.rb:140:in `initialize’ /Users/john/.rvm/gems/ruby-1.9.2-p320@qstream-ruby19/gems/actionpack-3.1.6/lib/abstract_controller/rendering.rb:74:in `initialize’ /Users/john/.rvm/gems/ruby-1.9.2-p320@qstream-ruby19/gems/actionpack-3.1.6/lib/abstract_controller/layouts.rb:301:in `initialize’ /Users/john/.rvm/gems/ruby-1.9.2-p320@qstream-ruby19/gems/actionpack-3.1.6/lib/action_dispatch/routing/url_for.rb:103:in `initialize’ /Users/john/.rvm/gems/ruby-1.9.2-p320@qstream-ruby19/gems/actionpack-3.1.6/lib/action_controller/metal.rb:140:in `initialize’ /Users/john/.rvm/gems/ruby-1.9.2-p320@qstream-ruby19/gems/actionpack-3.1.6/lib/abstract_controller/rendering.rb:74:in `initialize’ /Users/john/.rvm/gems/ruby-1.9.2-p320@qstream-ruby19/gems/actionpack-3.1.6/lib/abstract_controller/layouts.rb:301:in `initialize’ […]

在Ruby中实现二叉树: 我一直在尝试在Ruby中实现BinaryTree类，但是我得到了stack level too deep错误，尽管我似乎没有在该特定代码段中使用任何递归： 1. class BinaryTree 2. include Enumerable 3. 4. attr_accessor :value 5. 6. def initialize( value = nil ) 7. @value = value 8. @left = BinaryTree.new # stack level too deep here 9. @right = BinaryTree.new # and here 10. end 11. 12. def empty? 13. ( self.value == nil ) […]