fixed bug caused by wrong id in controller

app/controllers/principal_roles_controller.rb

@@ -8,7 +8,7 @@ class PrincipalRolesController < ApplicationController
       format.js do
         render(:update) do |page|
           principal_roles.each do |role|
-            page.remove "principal_role_option_#{role.role.id}"
+            page.remove "principal_role_option_#{role.role_id}"
             page.insert_html :top, 'table_principal_roles_body',
                              :partial => "principal_roles/show_table_row",
                              :locals => {:principal_role => role}
@@ -26,7 +26,7 @@ class PrincipalRolesController < ApplicationController
       format.js do
         render(:update) do |page|
           if @principal_role.valid?
-            page.replace "principal_role-#{@principal_role.role_id}",
+            page.replace "principal_role-#{@principal_role.id}",
                           :partial => "principal_roles/show_table_row",
                           :locals => {:principal_role => @principal_role}
           else

app/views/principal_roles/_show_table_row.html.erb

@@ -1,5 +1,5 @@
 <tr id="principal_role-<%= principal_role.id %>">
-<td class="role assigned_global_role_<%= principal_role.role.id%>">
+<td class="role assigned_global_role_<%= principal_role.role_id%>">
   <%=h principal_role.role %>
 </td>
 <%= call_hook(:principal_roles_table_row, :user => @user, :principal_role => principal_role )%>