登录名不能被修改

app/views/my/account.html.erb

@@ -40,7 +40,17 @@
         <li>&nbsp;&nbsp;</li>
       </ul>
       <ul class="setting_right ">
-        <li><%= f.text_field :login,:no_label=>true, :required => true, :style => "color:grey", :nh_required => "1", :name => "login", :class => "w210" %></li>
+        <li>
+          <%= f.text_field :login,
+                             :no_label => true,
+                             :required => true,
+                             :style => "color:grey",
+                             :disabled => 'disabled',
+                             :nh_required => "1",
+                             :name => "login",
+                             :class => "w210"
+            %>
+        </li>
         <% if @force %>
             <li><%= f.text_field :mail,:no_label=>true, :required => true,:nh_required => "1",:class=>"w210",:disabled=>'disabled'%></li>
         <% else %>