app/views/registrations/show.html.erb
<p id="notice"><%= notice %></p>
<p>
<b>User:</b>
<%= link_to @registration.user @registration.user %>
</p>
<p>
<b>Topic:</b>
<%= @registration.topic %>
</p>
<p>
<b>Repository:</b>
<%= @registration.repository %>
</p>
<%= link_to 'Edit', edit_registration_path(@registration) %>