## routes.rb

  map.resources :groups, :has_many => [:users, :events]
  map.resources :users, :has_many => [:events]
  map.resources :events


## event/index

<h1>Listing events</h1>
<% @events.each do |event| %>
	<h4><%=h event.title %></h4>
  <%=h event.happens_at %><br /><br />
  <%= link_to 'Show', polymorphic_path([event]) %> |
  <%= link_to 'Edit', edit_polymorphic_path(event) %> |
  <%= link_to 'Destroy', event, :confirm => 'Are you sure?', :method => :delete %>
<% end %>

<br /><br /><br />

<%= link_to 'New event', new_polymorphic_path(@events]) %>