(Novice, studying RestFul_Rails, rails 2.2.2)

Nested resource definition is as follows:

  map.resources :projects do |projects|
    projects.resources :iterations
  end

And in the project under the index view using the following code:

<% for project in @projects %>
  <tr>
    <td><%=h project.name %></td>
    <td><%=h project.des %></td>
    <td><%= link_to 'Show', project %></td>
    <td><%= link_to 'Edit', edit_project_path(project) %></td>
    <td><%= link_to 'Destroy', project, :confirm => 'Are you sure?', :method => :delete %></td>
    <td><%= link_to 'Iterations', iterations_path(project) %>



</td>
  </tr>
<% end %>

Results page error:

iterations_path undefined

I would like to ask how are going on? The teaching materials are too old to it?