Question

我知道这是一个新手问题，但我没有看到解释，我想要一个。

当Rails发出如下路由错误时，它究竟意味着什么：

Routing Error

No route matches {:action=>"show", :controller=>"library_imports", :library_id=>#<Library id: 1, ...

让我感到困惑的是，消息本身显示我的请求被路由到show控制器的library_imports操作。如果请求URL与任何路由不匹配，会发生什么情况？

为了完整起见，我遇到的导致此错误的URL是：

http://localhost:3000/libraries/2/library_imports

哪个应该映射到“索引”操作，而不是“显示”。

config/routes.rb的相关部分是：

Import::Application.routes.draw do

  resources :libraries do
    resources :library_imports
  end

rake routes输出的相关部分是：

    library_library_imports GET    /libraries/:library_id/library_imports(.:format)          {:action=>"index", :controller=>"library_imports"}
                            POST   /libraries/:library_id/library_imports(.:format)          {:action=>"create", :controller=>"library_imports"}
 new_library_library_import GET    /libraries/:library_id/library_imports/new(.:format)      {:action=>"new", :controller=>"library_imports"}
edit_library_library_import GET    /libraries/:library_id/library_imports/:id/edit(.:format) {:action=>"edit", :controller=>"library_imports"}
     library_library_import GET    /libraries/:library_id/library_imports/:id(.:format)      {:action=>"show", :controller=>"library_imports"}
                            PUT    /libraries/:library_id/library_imports/:id(.:format)      {:action=>"update", :controller=>"library_imports"}
                            DELETE /libraries/:library_id/library_imports/:id(.:format)      {:action=>"destroy", :controller=>"library_imports"}

Answer 1

错误消息误导了它不说的内容，而不是它所说的内容。确实没有可以从:controller => :library_imports, :action => :show, :library_id => @library构建的路由，因为该哈希忽略了所需的:id参数。

如果有一些提示，可能不那么令人困惑，例如(did you leave out a required parameter?）。

注意在url_for帮助程序中生成此错误（我相信），而不是在调度程序中生成此错误也很有用。因此，请求实际上并未被路由。

令人困惑的路由错误

1 个答案: