问题描述
由于某些原因，切换到Rails 3.2后我开始出现此错误.我想这与acl9插件有关，我尝试重新安装它，但没有任何改变.
For some reason I started to get this error after switching to Rails 3.2. I guess it has something to do with acl9 plugin, which I tried reinstalling, but nothing changed.
我将插件移至lib/plugins并将初始化程序添加至config/initializers，但同样，同样的错误.
I moved the plugins to lib/plugins and added initializer to config/initializers but again, same error.
我在Github上的acl9仓库中寻找解决方案，但在那里找不到任何东西.也许毕竟不是acl9.
I looked for solution at acl9 repo on Github, but could not find anything there. Maybe it is not acl9 after all.
我安装了回形针，acl9，authlogic.
I have paperclip, acl9, authlogic installed.
NoMethodError (undefined method `key?' for nil:NilClass):
actionpack (3.2.1) lib/action_controller/metal/hide_actions.rb:36:in `visible_action?'
actionpack (3.2.1) lib/action_controller/metal/hide_actions.rb:18:in `method_for_action'
actionpack (3.2.1) lib/action_controller/metal/implicit_render.rb:14:in `method_for_action'
actionpack (3.2.1) lib/action_controller/metal/compatibility.rb:61:in `method_for_action'
actionpack (3.2.1) lib/abstract_controller/base.rb:115:in `process'
actionpack (3.2.1) lib/abstract_controller/rendering.rb:45:in `process'
actionpack (3.2.1) lib/action_controller/metal.rb:203:in `dispatch'
actionpack (3.2.1) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.2.1) lib/action_controller/metal.rb:246:in `block in action'
actionpack (3.2.1) lib/action_dispatch/routing/route_set.rb:66:in `call'
actionpack (3.2.1) lib/action_dispatch/routing/route_set.rb:66:in `dispatch'
actionpack (3.2.1) lib/action_dispatch/routing/route_set.rb:30:in `call'
journey (1.0.3) lib/journey/router.rb:68:in `block in call'
journey (1.0.3) lib/journey/router.rb:56:in `each'
journey (1.0.3) lib/journey/router.rb:56:in `call'
actionpack (3.2.1) lib/action_dispatch/routing/route_set.rb:589:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.4.1) lib/rack/etag.rb:23:in `call'
rack (1.4.1) lib/rack/conditionalget.rb:25:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/head.rb:14:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/flash.rb:242:in `call'
rack (1.4.1) lib/rack/session/abstract/id.rb:205:in `context'
rack (1.4.1) lib/rack/session/abstract/id.rb:200:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/cookies.rb:338:in `call'
activerecord (3.2.1) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:443:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.1) lib/active_support/callbacks.rb:405:in `_run__3140920687338355213__call__3168118505970967148__callbacks'
activesupport (3.2.1) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.1) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.1) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.1) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/reloader.rb:65:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.1) lib/rails/rack/logger.rb:26:in `call_app'
railties (3.2.1) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.1) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.1) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.1) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.1) lib/rack/lock.rb:15:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/static.rb:53:in `call'
railties (3.2.1) lib/rails/engine.rb:479:in `call'
railties (3.2.1) lib/rails/application.rb:220:in `call'
rack (1.4.1) lib/rack/content_length.rb:14:in `call'
railties (3.2.1) lib/rails/rack/log_tailer.rb:14:in `call'
rack (1.4.1) lib/rack/handler/webrick.rb:59:in `service'
/Users/project/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
/Users/project/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
/Users/project/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'
编辑(已解决):花了很长时间才弄清楚，但我仍然不太确定发生了什么.我认为这与acl9对Rails 3.1+的支持有关，但是最后我还是从github上获取了acl9代码，一切突然开始起作用.
EDIT (SOLVED): It took quite a while to figure out and I am still not quite sure what happened. I think it has to do with acl9's support for Rails 3.1+ But in the end I took the acl9 code from github and everything suddenly started working.
推荐答案
我是RoR的新手，在通过RoR入门指南"时遇到了相同的错误.
I am a newbie to RoR and got the same error while going through RoR "Getting started guide".
这听起来可能很愚蠢，但是其他人可能会犯与我相同的错误，因此请从新手的角度发布我在RoR中注意到的内容，
This may sound silly, but others might make the same mistake as I am, so posting what I noticed in RoR from newbie's eyes,
validates :name, : presence => true
请注意:presence"，应为:presence".现在，Rail会引发语法错误
Note ": presence", it should be ":presence". Now the Rail throws a Syntax error
C:/blog/app/models/post.rb:4: syntax error, unexpected ':', expecting keyword_end
validates :name, : presence => true
但是，如果您刷新"浏览器，它将隐藏语法错误，而是显示
But if you "Refresh" Your browser, it hides the syntax error, instead gives
undefined method `key?' for nil:NilClass
似乎Rails缓存是罪魁祸首. :)
It seems Rails caching is the culprit. :)
这篇关于Rails 3.2未定义方法“键?"对于nil:NilClass的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！