scinote-web/app/views/user_notifications/_list.html.erb

<% @notifications.each do |notification| %>
  <li class="notification <%= 'unseen' unless notification.already_seen(current_user) %>">
    <div class="row">
      <div class="col-xs-3 col-md-1">
        <% if notification.type_of == 'recent_changes' %>
        <div class="text-center">
          <%= image_tag avatar_path(notification.generator_user, :icon_small), class: 'avatar img-circle' %>
        </div>
        <% end %>
        <% if notification.type_of == 'assignment' %>
        <div class="text-center">
          <span class="assignment"><%= fa_icon 'newspaper-o' %></span>
        </div>
        <% end %>
        <% if notification.type_of == 'system_message' %>
        <div class="text-center">
          <span class="system-message"><i class="glyphicon glyphicon-tower" aria-hidden="true"></i></span>
        </div>
        <% end %>
      </div>
      <div class="col-xs-9 col-md-11">
        <strong><%= notification.title.html_safe %></strong> <br>
        <%= l(notification.created_at, format: :full) %> | <%= notification.message.html_safe %>
      </div>
    </div>
  </li>
<% end %>