anchor.diff:  
           <%= text_field_tag :value %>
           <%= select_tag :scope, options_for_select(['Group', 'User']) %>
  -        <%= submit_tag 'Add' %>
  +        <br />
  +        <%= submit_tag 'Update' %>
       <% end %>
    
   </div>
  
positive.code:         <tbody>
            <% @mediaobject.group_exceptions.each do |group| %>
          <tr>
            <td><%= check_box_tag 'groups[remove]', group %></td>
            <td><%= group %></td>
          </tr>
        <% end %>
        </tbody>
  
negative.code:         <tbody>
            <% @mediaobject.user_exceptions.each do |user| %>
          <tr>
            <td><%= check_box_tag 'users[remove]', user %>
            <%= user %></td>
          </tr>
        <% end %>
        </tbody>
  