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我很欣赏这是 Ruby 中一个非常常见的错误。我刚刚开始学习 Ruby on Rails，但我发现这基本上来自于将错误数量的参数传递给方法。

我正在阅读 Ruby 文档，似乎拥有根路径的标准方法是拥有PagesController一个main视图。在“routes.rb”中，我有：

root to: 'pages#main'

这是我的PagesController：

class PagesController < ApplicationController
  def main

  end
end

据我了解，main这是我尝试访问的默认路由。我有一个main不带任何参数的方法，但不知何故它被传递了一个。我在哪里错了？

错误：

ArgumentError in PagesController#main 
wrong number of arguments(1 for 0)

Rails.root: C:/RubymineProjects/ShoppingApp

全跟踪：

actionpack (4.0.1) lib/abstract_controller/base.rb:89:in `initialize'
actionpack (4.0.1) lib/abstract_controller/base.rb:89:in `new'
actionpack (4.0.1) lib/abstract_controller/base.rb:89:in `action_methods'
actionpack (4.0.1) lib/action_controller/metal/hide_actions.rb:36:in `action_methods'
actionpack (4.0.1) lib/abstract_controller/url_for.rb:25:in `action_methods'
actionpack (4.0.1) lib/abstract_controller/base.rb:179:in `action_method?'
actionpack (4.0.1) lib/abstract_controller/base.rb:230:in `method_for_action'
actionpack (4.0.1) lib/action_controller/metal/hide_actions.rb:17:in `method_for_action'
actionpack (4.0.1) lib/action_controller/metal/implicit_render.rb:14:in `method_for_action'
actionpack (4.0.1) lib/abstract_controller/base.rb:130:in `process'
actionpack (4.0.1) lib/abstract_controller/rendering.rb:44:in `process'
actionpack (4.0.1) lib/action_controller/metal.rb:195:in `dispatch'
actionpack (4.0.1) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
actionpack (4.0.1) lib/action_controller/metal.rb:231:in `block in action'
actionpack (4.0.1) lib/action_dispatch/routing/route_set.rb:80:in `call'
actionpack (4.0.1) lib/action_dispatch/routing/route_set.rb:80:in `dispatch'
actionpack (4.0.1) lib/action_dispatch/routing/route_set.rb:48:in `call'
actionpack (4.0.1) lib/action_dispatch/journey/router.rb:71:in `block in call'
actionpack (4.0.1) lib/action_dispatch/journey/router.rb:59:in `each'
actionpack (4.0.1) lib/action_dispatch/journey/router.rb:59:in `call'
actionpack (4.0.1) lib/action_dispatch/routing/route_set.rb:680:in `call'
rack (1.5.2) lib/rack/etag.rb:23:in `call'
rack (1.5.2) lib/rack/conditionalget.rb:25:in `call'
rack (1.5.2) lib/rack/head.rb:11:in `call'
actionpack (4.0.1) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.0.1) lib/action_dispatch/middleware/flash.rb:241:in `call'
rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context'
rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call'
actionpack (4.0.1) lib/action_dispatch/middleware/cookies.rb:486:in `call'
activerecord (4.0.1) lib/active_record/query_cache.rb:36:in `call'
activerecord (4.0.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:626:in `call'
activerecord (4.0.1) lib/active_record/migration.rb:369:in `call'
actionpack (4.0.1) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.0.1) lib/active_support/callbacks.rb:373:in `_run__897547547__call__callbacks'
activesupport (4.0.1) lib/active_support/callbacks.rb:80:in `run_callbacks'
actionpack (4.0.1) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.0.1) lib/action_dispatch/middleware/reloader.rb:64:in `call'
actionpack (4.0.1) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
actionpack (4.0.1) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
actionpack (4.0.1) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.0.1) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.0.1) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.0.1) lib/active_support/tagged_logging.rb:67:in `block in tagged'
activesupport (4.0.1) lib/active_support/tagged_logging.rb:25:in `tagged'
activesupport (4.0.1) lib/active_support/tagged_logging.rb:67:in `tagged'
railties (4.0.1) lib/rails/rack/logger.rb:20:in `call'
actionpack (4.0.1) lib/action_dispatch/middleware/request_id.rb:21:in `call' 
rack (1.5.2) lib/rack/methodoverride.rb:21:in `call' 
rack (1.5.2) lib/rack/runtime.rb:17:in `call' 
activesupport (4.0.1) lib/active_support/cache/strategy/local_cache.rb:83:in `call' 
rack (1.5.2) lib/rack/lock.rb:17:in `call' 
actionpack (4.0.1) lib/action_dispatch/middleware/static.rb:64:in `call' 
rack (1.5.2) lib/rack/sendfile.rb:112:in `call' 
railties (4.0.1) lib/rails/engine.rb:511:in `call' 
railties (4.0.1) lib/rails/application.rb:97:in `call' 
rack (1.5.2) lib/rack/lock.rb:17:in `call' 
rack (1.5.2) lib/rack/content_length.rb:14:in `call' 
rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service'
C:/Ruby193/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
C:/Ruby193/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
C:/Ruby193/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'
4

2 回答 2

1

做

root 'pages#main'

解决这个问题？（在 rails 4 中，文档没有提到“to:”）

于 2013-11-06T15:49:25.850 回答
0

我遇到过同样的问题。

除了我，我使用了一个我不应该使用的 rails 词。

在我的 routes.rb 文件中：

root :to => 'static#main'

我得到了和你一样的错误。

在 static_controller.rb 我有

class StaticController < ApplicationController

  def main
  end

  def blog
  end

  def about
  end

  def process
  end


end

问题是名为 process 的方法。我将其更改为 myprocess 并且一切正常。

Rails 就像你的另一半。当出现问题时真的很烦人和令人沮丧，但他们不会告诉你是什么，但当一切都按应有的方式进行时，他们会非常棒和棒极了。

于 2013-12-26T14:35:37.760 回答