Rails 中的 ArgumentError::WelcomeController#index答案

【问题标题】：ArgumentError in Rails::WelcomeController#indexRails 中的 ArgumentError::WelcomeController#index
【发布时间】：2013-11-06 13:31:52
【问题描述】：

我是 Ruby on Rails 的新手。在创建新应用程序并启动 http://localhost:3000/ 时出现以下错误：

wrong number of arguments(1 for 0)

Full trace is as follows:

actionpack (4.0.0) lib/abstract_controller/base.rb:89:in `initialize'
actionpack (4.0.0) lib/abstract_controller/base.rb:89:in `new'
actionpack (4.0.0) lib/abstract_controller/base.rb:89:in `action_methods'
actionpack (4.0.0) lib/action_controller/metal/hide_actions.rb:36:in `action_methods'
actionpack (4.0.0) lib/abstract_controller/url_for.rb:25:in `action_methods'
actionpack (4.0.0) lib/abstract_controller/base.rb:179:in `action_method?'
actionpack (4.0.0) lib/abstract_controller/base.rb:230:in `method_for_action'
actionpack (4.0.0) lib/action_controller/metal/hide_actions.rb:17:in `method_for_action'
actionpack (4.0.0) lib/action_controller/metal/implicit_render.rb:14:in `method_for_action'
actionpack (4.0.0) lib/abstract_controller/base.rb:130:in `process'
actionpack (4.0.0) lib/abstract_controller/rendering.rb:44:in `process'
actionpack (4.0.0) lib/action_controller/metal.rb:195:in `dispatch'
actionpack (4.0.0) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
actionpack (4.0.0) lib/action_controller/metal.rb:231:in `block in action'
actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:80:in `call'
actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:80:in `dispatch'
actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:48:in `call'
actionpack (4.0.0) lib/action_dispatch/journey/router.rb:71:in `block in call'
actionpack (4.0.0) lib/action_dispatch/journey/router.rb:59:in `each'
actionpack (4.0.0) lib/action_dispatch/journey/router.rb:59:in `call'
actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:655: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 (4.0.0) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.0.0) 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 (4.0.0) lib/action_dispatch/middleware/cookies.rb:486:in `call'
activerecord (4.0.0) lib/active_record/query_cache.rb:36:in `call'
activerecord (4.0.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:626:in `call'
activerecord (4.0.0) lib/active_record/migration.rb:369:in `call'
actionpack (4.0.0) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.0.0) lib/active_support/callbacks.rb:373:in `_run__170541183__call__callbacks'
activesupport (4.0.0) lib/active_support/callbacks.rb:80:in `run_callbacks'
actionpack (4.0.0) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.0.0) lib/action_dispatch/middleware/reloader.rb:64:in `call'
actionpack (4.0.0) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
actionpack (4.0.0) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
actionpack (4.0.0) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.0.0) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.0.0) lib/rails/rack/logger.rb:21:in `block in call'
activesupport (4.0.0) lib/active_support/tagged_logging.rb:67:in `block in tagged'
activesupport (4.0.0) lib/active_support/tagged_logging.rb:25:in `tagged'
activesupport (4.0.0) lib/active_support/tagged_logging.rb:67:in `tagged'
railties (4.0.0) lib/rails/rack/logger.rb:21:in `call'
actionpack (4.0.0) 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 (4.0.0) lib/active_support/cache/strategy/local_cache.rb:83:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
actionpack (4.0.0) lib/action_dispatch/middleware/static.rb:64:in `call'
railties (4.0.0) lib/rails/engine.rb:511:in `call'
railties (4.0.0) 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:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'

谁能帮我解决一下？

编辑：

我的welcome_controller.rb 包含：

class WelcomeController < ApplicationController
  def index
  end
end

我的 routes.rb 包含：

Railsgirls::Application.routes.draw do
  get "welcome/index"
end

【问题讨论】：

您能否发布您的 Welcome Controller index 操作，并且该错误暗示您在某处提供了一个参数并且它不接受任何参数，因此 (1 for 0) 参数错误
这是你的 ruby 和 rails 版本.. 你能发布你的 gem 文件吗

标签： ruby-on-rails ruby ruby-on-rails-3 ruby-on-rails-3.1 rubygems

【解决方案1】：

您似乎将ruby 1.9.1 与rails 4.0.0 一起使用，但rails 4 仅适用于ruby 1.9.3+ http://rubyonrails.org/download

【讨论】：

【解决方案2】：

在您的路线中使用

get "welcome#index"

否则，您将声明一个命名空间。

使用

rake routes

看看你的路线是如何声明的

【讨论】：

考虑到他正在打开 localhost:3000，他可能想要 root 方法而不是 get。
正确，但一步一步
我也试过这个。似乎不起作用。而rake routes 则返回：前缀动词 URI 模式控制器#Action root GET / welcome#index

【解决方案3】：

试试这个内部路由而不是get：

root to: 'welcome#index'

【讨论】：

我试过这个。似乎不起作用。编辑 routes.rb 后是否需要执行任何其他步骤？
你得到同样的错误吗？如果错误是相同的，您是在创建您的应用程序后得到它，还是在您添加一些代码后开始发生？尝试创建一个新的 rails 应用程序并尝试在不添加任何自定义代码的情况下启动它 - 它仍然抛出错误吗？还有为什么你在新项目中使用这么旧的版本？