The menu I want to show to the users changes depending on their rights After user authentication I redirect to my menu action which calls its view

access/menu.html.erb

    <% if admin? %>

   <%form_for(:user, :url => {:controller => 'admin_users',:name => session[:username]}) do |admin|%>
   <ul><h2>Administrator: <%=session[:username]%></h2></ul>
   <%= render(:partial =>'admin_form',:locals => {:admin => admin})%>
   <%end%>

   <%else%>

    <%form_for(:user, :url => {:controller => 'students',:name => session[:username]}) do |student|%>
    <ul><h2>???????: <%=session[:surname].to_s + " " + session[:name].to_s%></h2></ul>
    <%= render(:partial =>'student_form',:locals => {:student => student})%>
    <%end%>
<%end%>

And the forms look:

_student_form:

<table> 
   <ul>  
     <li><%=link_to '?????',{:controller => 'students'}%></li>
   </ul>
   <ul>
      <li><%=link_to '?????? ?????????',{:controller => 'students'}%></li>
   </ul>
   <ul>
     <li><%=link_to '???????? ?????? ????',{:controller => 'students'}%></li>
    </ul> 
   <ul>
       <li><%=link_to '???????? ??????',{:controller => 'students'}%></li>
   </ul> 
   <ul>
      <td>&nbsp;</td>
   </ul> 
 </table>

_admin_form:

<table> 
 <ul>  
 <li><%=link_to '?????????? ????????????????',{:controller => 'AdminUsers',:role_id => 1}%></li>
 </ul>
 <ul>
 <li><%=link_to '?????????? ????????',{:controller => 'AdminUsers',:role_id => 2}%></li>
 </ul>
 <ul>
  <li><%=link_to '?????????? ??????????',{:controller => 'AdminUsers',:role_id => 3}%></li>
 </ul>
 <ul>
 <li><%=link_to '?????????? ???????????',:controller => 'subjects'%></li>
 </ul> 
 <ul>
 <td>&nbsp;</td>
 </ul>
</table>

If a log in as a student I get:

But if I log in as an administrator I get

How can this be posible??