Coursen show:

<h1><%= @course.name %></h1>
<p>
<%= @course.description %>
</p>

<ul>
	<% @course.course_instances.each do |ci| %>

		<li><%= link_to ci.name, course_course_instance_url(ci) %></li>

	<%end%>


</ul>

<%= link_to 'Edit', edit_course_path(@course) %> |
<%= link_to 'Back', courses_path %>

routes:

ActionController::Routing::Routes.draw do |map|
  map.resources :courses do |course|
    course.resources :course_instances do |instance|
      instance.resources :exercise_groups
    end
  end

  map.resources :users
  map.resource :session
  map.resources :sessions



  map.namespace(:admin) do |admin|
     admin.resources :users,
     :active_scaffold => true
     admin.resources :courses, :active_scaffold => true
   end


  map.root :controller=>:courses, :action=>:index

end