wcs: add count filter (#49406)

combo/apps/wcs/templatetags/wcs.py

@@ -23,3 +23,8 @@ register = template.Library()
 @register.filter
 def objects(cards, slug):
     return getattr(cards, slug).objects
+
+
+@register.filter
+def count(queryset):
+    return queryset.count

tests/test_wcs_templatetags.py

@@ -108,3 +108,9 @@ def test_errors(mock_send, context, nocache):
 
     mock_send.side_effect = lambda *a, **k: MockedRequestResponse(content=json.dumps({'data': None}))
     assert t.render(context) == "[]"
+
+
+@mock.patch('combo.apps.wcs.models.requests.send', side_effect=mocked_requests_send)
+def test_count(mock_send, context, nocache):
+    t = Template('{% load wcs %}{{ cards|objects:"foo"|count }}')
+    assert t.render(context) == "2"