控制器命名空间和路由问题

Question

我创建了一个路由测试Rails3中应用的一个典范 '用户'：

rails new routing_test_app 
rails generate model User name:string 
rails generate scaffold_controller admin/user 
rake db:migrate 

加入routes.db：

namespace :admin do 
    resources :users 
end 

耙路线

admin_users GET /admin/users(.:format)   {:action=>"index", :controller=>"admin/users"} 
admin_users POST /admin/users(.:format)   {:action=>"create", :controller=>"admin/users"} 
new_admin_user GET /admin/users/new(.:format)  {:action=>"new", :controller=>"admin/users"} 
edit_admin_user GET /admin/users/:id/edit(.:format) {:action=>"edit", :controller=>"admin/users"} 
admin_user GET /admin/users/:id(.:format)  {:action=>"show", :controller=>"admin/users"} 
admin_user PUT /admin/users/:id(.:format)  {:action=>"update", :controller=>"admin/users"} 
admin_user DELETE /admin/users/:id(.:format)  {:action=>"destroy", :controller=>"admin/users"} 

views/admin/users/_form.html.erb

<%= form_for(@admin_user) do |f| %> 
    <% if @admin_user.errors.any? %> 
    <div id="error_explanation"> 
     <h2><%= pluralize(@admin_user.errors.count, "error") %> prohibited this admin_user from being saved:</h2> 

     <ul> 
     <% @admin_user.errors.full_messages.each do |msg| %> 
     <li><%= msg %></li> 
     <% end %> 
     </ul> 
    </div> 
    <% end %> 
    <%= f.text_field :name %> 
    <div class="actions"> 
    <%= f.submit %> 
    </div> 
<% end %> 

当我去的 'http：//本地主机：3000 /管理/用户/新' 轨道抛出一个错误：

undefined method `users_path' for #<#<Class:0x0000010116ca90>:0x000001011588d8> 

提取的源（左右线＃1）：

1: <%= form_for(@admin_user) do |f| %> 
2: <% if @admin_user.errors.any? %> 
3:  <div id="error_explanation"> 
4:  <h2><%= pluralize(@admin_user.errors.count, "error") %> prohibited this admin_user from being saved:</h2> 

Answer 1

这是因为@admin_user是User对象，所以Rails的猜测网址助手是users_path。这是一个简单的修复。只需将@admin_userform_for参数替换为[:admin, @admin_user]即可。您可能还想重新命名实例变量@user以减少重新排序。必须使用该数组是使用名称空间的缺点，所以应该始终考虑这一点。

Answer 2

form_for方法不会猜测嵌套的路由。试试这个：

form_for [:admin, @admin_user] do |f|