anchor.diff:          <td><%= l participant.birthdate %></td>
           <td><%= flag_tag participant.country.country_code %></td>
           <td>
  -          <%= participant.appearances.joins(:performance).where(performances: { competition_id: @competition }).size %>
  +          <% participant.performances.in_competition(@competition).includes(:category).each do |performance| %>
  +            <%= link_to performance.category.name, jmd_performance_path(performance) %><br>
  +          <% end %>
  +        </td>
  +    </p>
           </td>
           <td>
             <%= link_to_modal icon_tag("eye-open", title: "Teilnehmerdetails anzeigen"), :participant, participant.id %>
  
positive.code:       <th>Vorname</th>
        <th>Geburtsdatum</th>
        <th>Land</th>
        <th>Auftritte</th>
        <th>&nbsp;</th>
      </tr>
    </thead>
  
negative.code: <% provide(:title, "Teilnehmer für #{@competition.name}") %>
  
  <p>
    <%= link_to "Wettbewerbsdetails anzeigen", jmd_competition_path(@competition), class: "btn" %>
  