Ruby on Rails Exception：Routing Error

2010-07-28 16:50 chenkai 阅读(2632) 评论(0) 编辑收藏举报

当开始做Ruby on Rails实际编程时,对于初学者而言总会有些让人感到未知的Exception, 上次以手工方式写了一个简单的Rails Application, 今天下午换用Red Rails工具编译器,和上次关于Rails配置完全相同却出现一个Exception: Routing Error. 具体截图如下:

提示Exception 信息:"No Route matches：/say/hello with {:method=>get}" .

<1>Rails下两个目录Public/Config

<1.1>Public目录

Rails框架是基于MVC架构的,在创建的项目Public目录中是我们要暴露给用户文件,其中包含关键文件分发器-dispatcher. 其中包含三个文件:dispatch.cgi/dispatch.fcgi/dispatch.rb.而分发器主要作用是: 负责接收用户从浏览器发送的请求,并将这些请求引导指定程序的程序代码, 也就是传送给MVC中Controller. 可以看出它是起引导请求的作用.

<1.2>Config目录

Config目录顾名思义,是对整个Rails Application进行配置, 其中涉及数据库/运行环境,另外一个就是路由规则定义, 这个指定文件为routes.rb

而一般对于Routing Error这类异常应该首先查看Rails Application路由访问规则. 打开文件:

ActionController::Routing::Routes.draw do |map|
  # The priority is based upon order of creation: first created -> highest priority.
 
  # Sample resource route (maps HTTP verbs to controller actions automatically):
  #   map.resources :products  
  # You can have the root of your site routed with map.root -- just remember to delete public/index.html.
  # map.root :controller => "welcome"
 
  # See how all your routes lay out with "rake routes"
 
  # Install the default routes as the lowest priority.
  # Note: These default routes make all actions in every controller accessible via GET requests. You should
  # consider removing or commenting them out if you're using named routes and resources.
  map.connect ':controller/:action/:id'
  map.connect ':controller/:action/:id.:format'
end

能够看到Rails Application默认的路由规则访问定义:主要有两种访问方式 id则是From附属参数.如果我们定义好了Controller, 按照Rails访问路径:http://localhost:3000/say/hello 这种方式违背了Rails 路由规则,导致我们请求找不到指定Controller来处理. 只要稍作修改在原有路径基础上随意添加一个参数:

http://localhost:3000/say/hello/12 在来尝试访问: