school-platform/app/views/courses/_participants_panel.html.erb

<div class="panel panel-primary">
  <div class="panel-heading">
    <%= role.to_s.capitalize.pluralize %>
  </div>
  <table class="panel-body table table-striped table-bordered table-hover">
    <tbody>
      <% for user in users %>
        <tr>
          <td>
            <%= render user %>
          </td>
          <% if current_user.is_administrator_at?(@course.school) || current_user.admin? %>
            <td>
              <%= form_for @course.course_participations.find_by(user_id: user.id), html: { method: :delete } do |f| %>
                <%= f.submit "Remove", class: "btn btn-danger" %>
              <% end %>
            </td>
          <% end %>
        </tr>
      <% end %>
    </tbody>
  </table>
  <div class="panel-footer">
    <% if current_user.is_administrator_at?(@course.school) || current_user.admin? %>
      <%= render partial: 'course_participations/form', locals: { role: role } %>
    <% end %>
  </div>
</div>