app/views/admin/seats/_breadcrumb.html.erb
<ol class="breadcrumb">
<li><%= link_to "Seats", admin_seats_path %></li>
<% if current_page == "show" %>
<li class="active">Seat #<%= @seat.id.to_s %></li>
<% elsif current_page == "new" %>
<li class="active">New</li>
<% elsif current_page == "edit" %>
<li><%= link_to "Seat #"+@seat.id.to_s, admin_seat_path(@seat) %></li>
<li class="active">Edit</li>
<% end %>
</ol>