app/views/topics/index.html.erb
<h1>Listing topics</h1>
<table>
<tr>
<th>Subject</th>
<th>Abstract</th>
<th>Detail</th>
<th>Additional info</th>
</tr>
<% @topics.each do |topic| %>
<tr>
<td><%= topic.subject %></td>
<td><%= topic.abstract %></td>
<td><%= topic.detail %></td>
<td><%= topic.additional_info %></td>
</tr>
<% end %>
</table>