<table>
<tr>
-<th>active</th>
-<th>title</th>
+<th><a href="?sort_by={% if sort_by == "is_active" %}-{% endif %}is_active">active</a></th>
+<th><a href="?sort_by={% if sort_by == "title" %}-{% endif %}title">title</a></th>
</tr>
{% for condition in conditions %}
<tr>