Rails中的namespace

在Rails中可以通过namespace来管理controller。
首先生成scaffold:
script/generate scaffold article title:string body:text
在routes.rb中添加如下路由：

map.namespace :admin  do   | admin |
    admin.resources :articles
end

由意味着给article增加了一个名为admin的namespace,将controllers中的articles_controller.rb修改为controllers/admin/articles_controller.rb，也就是将这个控制器放到admin这个文件夹中。

先看一下相应的路由规则,执行rake roures:

admin_articles GET     / admin / articles   {:action => " index " , :controller => " admin/articles " }
formatted_admin_articles GET     / admin / articles.:format          {:action => " index " , :controller => " admin/articles " }
                             POST    / admin / articles                  {:action => " create " , :controller => " admin/articles " }
                             POST    / admin / articles.:format          {:action => " create " , :controller => " admin/articles " }
           new_admin_article GET     / admin / articles / new               {:action => " new " , :controller => " admin/articles " }
 formatted_new_admin_article GET     / admin / articles / new .:format      {:action => " new " , :controller => " admin/articles " }
          edit_admin_article GET     / admin / articles / :id / edit         {:action => " edit " , :controller => " admin/articles " }
formatted_edit_admin_article GET     / admin / articles / :id / edit.:format {:action => " edit " , :controller => " admin/articles " }
               admin_article GET     / admin / articles / :id              {:action => " show " , :controller => " admin/articles " }
     formatted_admin_article GET     / admin / articles / :id.:format      {:action => " show " , :controller => " admin/articles " }
                             PUT     / admin / articles / :id              {:action => " update " , :controller => " admin/articles " }
                             PUT     / admin / articles / :id.:format      {:action => " update " , :controller => " admin/articles " }
                             DELETE  / admin / articles / :id              {:action => " destroy " , :controller => " admin/articles " }

                             DELETE  / admin / articles / :id.:format      {:action => " destroy " , :controller => " admin/articles " }

                                     / :controller / :action / :id
                                     / :controller / :action / :id.:format

对比一下不加admin这个namespace时的路由：

article_index GET     / article                         {:action => " index " , :controller => " article " }
formatted_article_index GET     / article.:format                 {:action => " index " , :controller => " article " }
                        POST    / article                         {:action => " create " , :controller => " article " }
                        POST    / article.:format                 {:action => " create " , :controller => " article " }
            new_article GET     / article / new                      {:action => " new " , :controller => " article " }
  formatted_new_article GET     / article / new .:format             {:action => " new " , :controller => " article " }
           edit_article GET     / article / :id / edit                {:action => " edit " , :controller => " article " }
 formatted_edit_article GET     / article / :id / edit.:format        {:action => " edit " , :controller => " article " }
                article GET     / article / :id                     {:action => " show " , :controller => " article " }
      formatted_article GET     / article / :id.:format             {:action => " show " , :controller => " article " }
                        PUT     / article / :id                     {:action => " update " , :controller => " article " }
                        PUT     / article / :id.:format             {:action => " update " , :controller => " article " }
                        DELETE  / article / :id                     {:action => " destroy " , :controller => " article " }
                        DELETE  / article / :id.:format             {:action => " destroy " , :controller => " article " }
                                / :controller / :action / :id
                                / :controller / :action / :id.:format

所有的路由规则上面，都加上了admin这个namespace。

下面就要将views目录下面的articles目录改到views/admin目录下面，因为根据路由规则，会到views/admin/articles/目录下面去查找相应的模板。

另外，还需要将原来的new_article_url | new_article_path等helper方法修改为new_admin_article_url | new_admin_article_path，将这些helper方法全部加上admin这个namespace。