Merge branch 'fix/events-date-sort-admin' into 'master'

Fix sorting of registration dates in event admin

Closes #653

See merge request thalia/concrexit!854

website/events/static/events/js/admin.js

@@ -57,6 +57,17 @@ django.jQuery(function () {
         type: "numeric"
     });
 
+    $.tablesorter.addParser({
+        id: "date",
+        is: function(s) {
+            return false;
+        },
+        format: function(s, t, node) {
+            return $(node).attr("data-sortval");
+        },
+        type: "text"
+    });
+
     $("table").tablesorter({
 		sortList: [[1,0]],
         cssHeader: 'sortable',

website/events/templates/events/admin/registrations_table.html

@@ -4,9 +4,9 @@
         <thead>
             <tr>
                 <th scope="col">{% trans "name"|capfirst %} <span class="toggle"></span></th>
-                <th scope="col">{% trans "registration date"|capfirst %} <span class="toggle"></span></th>
+                <th scope="col" data-meta="{sorter: 'date'}">{% trans "registration date"|capfirst %} <span class="toggle"></span></th>
                 {% if cancellations %}
-                <th scope="col">{% trans "cancellation date"|capfirst %} <span class="toggle"></span></th>
+                <th scope="col" data-meta="{sorter: 'date'}">{% trans "cancellation date"|capfirst %} <span class="toggle"></span></th>
                 {% endif %}
                 {% for field in fields %}
                 <th scope="col">{{ field.name }} <span class="toggle"></span></th>
@@ -37,9 +37,9 @@
                 {% else %}
                 <td>{{ registration.name }}</td>
                 {% endif %}
-                <td>{{ registration.date }}</td>
+                <td data-sortval="{{ registration.date|date:'c' }}">{{ registration.date }}</td>
                 {% if cancellations %}
-                <td>{{ registration.date_cancelled }}</td>
+                <td data-sortval="{{ registration.date|date:'c' }}">{{ registration.date_cancelled }}</td>
                 {% endif %}
                 {% for field in registration.information_fields %}
                     {% if not field.value %}