Add UserAttribute model, suppose it will store user model want to use which attribute group

app/models/user.rb

@@ -3,4 +3,6 @@ class User
  
   devise :authenticatable, :recoverable, :rememberable, :trackable
   
+  key :use_attributes
+    
 end

app/models/user_attribute.rb

@@ -0,0 +1,9 @@
+class UserAttribute
+  
+  include MongoMapper::Document
+  
+  key :ident, String
+  key_i18n :name, String
+  key_i18n :attrs, Array
+  
+end

app/views/panel/users/index.html.erb

@@ -8,16 +8,21 @@
 
 <table>
   <tr>
-     <th>Name</th>
+    <th>Attrs</th>
+    <th>Name</th>
     <th>Email</th>
     <th>Action</th>
   </tr>
 
 <% @users.each do |user| %>
 <tr>
+    <td><%= user.use_attributes.join(",") %></td>
     <td><%#= user.name %></td>
     <td><%= user.email %></td>
-    <td><%= link_to 'Edit', edit_panel_user_path(user) %> | <%= link_to 'Destroy', panel_user_path(user), :method => :delete %></td>
+    <td>
+        <%= link_to 'Show', panel_user_path(user) %>
+        <%= link_to 'Edit', edit_panel_user_path(user) %> | 
+        <%= link_to 'Destroy', panel_user_path(user), :method => :delete %></td>
 </tr>    
 <% end %>
 </table>

app/views/panel/users/show.html.erb

@@ -0,0 +1,10 @@
+<% content_for :secondary do %>
+    <ul class="list">
+        <li><%= link_to t(:new_user, :scope => :panel), new_panel_user_path, :class => 'button positive' %></li>
+    </ul>
+<% end -%>
+
+<h1>Users panel</h1>
+
+<%=h @user.name %>
+<%=h @user.email %>

lib/tasks/dev.rake

@@ -2,7 +2,10 @@ namespace :dev do
   
   task :build => :environment do
     User.delete_all
-    User.create!( :email => 'ihower@rulingcom.com', :password => 'password', :password_confirmation => 'password' )
+    User.create!( :email => 'ihower@rulingcom.com', :password => 'password', :password_confirmation => 'password', :use_attributes => ["teacher"] )
+    
+    UserAttribute.create!( :ident => "teacher", :name => "Teacher", :attrs => [ "name"  => { :type => 'text_field', :width => 100 }, 
+                                                           "title" => { :type => 'text_field', :width => 100 } ] )
     
     [Announcement, Item, Snippet, Layout].each { |m| m.delete_all }
       Layout.create!( :name => 'root', :description => 'root', :content_zh_tw => File.open("#{RAILS_ROOT}/lib/template/root.layout.zh_tw").read,