app/views/superusers/index.html.erb
<% title "Manage Superusers" %>
<%= field_set_tag 'Add superuser' do %> <br />
<div>
With great power comes great responsiblity. Please use this wisely. (That's why you can only add one at a time)
</div> <br />
<%= form_tag add_superusers_path do %>
Enter login of the user who want to make superuser:<br />
<%= text_field_tag 'new_su_login' %>
<%= submit_tag "Add" %>
<% end %>
<% end %> <br />
<h2>Existing superuser list:</h2>
<%= form_tag remove_superusers_path do %>
<table class="tablesorter">
<thead>
<tr>
<th>Login</th>
<th>Name</th>
<th>Remove superuser?</th>
</tr>
</thead>
<tbody>
<% @superusers.each do |su| %>
<tr>
<td><%= su.login %></td>
<td><%= link_to su.name, user_path(su) %></td>
<td><%= check_box_tag("remove_su_ids[#{su.id}]", su.id, false, name: "remove_su_ids[]") %></td>
</tr>
<% end %>
</tbody>
</table>
<%= submit_tag "Remove selected" %>
<% end %>