templatetags: add filter to create set (#67049)

tests/test_templates.py

@@ -1318,6 +1318,25 @@ def test_adjust_to_week_monday(pub):
     assert t.render({'value': datetime.datetime(2021, 6, 14, 0, 0)}) == '2021-06-14'
 
 
+def test_convert_as_set():
+    tmpl = Template('{{ foo|set|join:","}}')
+
+    def render(value):
+        return set(tmpl.render({'foo': value}).split(','))
+
+    assert render(['foo', 'foo', 'bar']) == {'foo', 'bar'}
+
+    def list_generator():
+        yield from range(5)
+
+    assert render(list_generator) == set(map(str, range(5)))
+
+    def list_range():
+        return range(5)
+
+    assert render(list_range) == set(map(str, range(5)))
+
+
 def test_iterate_days_until(pub):
     t = Template(
         '{% for day in value|iterate_days_until:value2 %}{{ day }}{% if not forloop.last %}, {% endif %}{% endfor %}'

wcs/qommon/templatetags/qommon.py

@@ -947,6 +947,12 @@ def list_(value):
     return list(unlazy(value))
 
 
+@register.filter(name='set')
+def set_(value):
+    # turn a generator into a set
+    return set(unlazy(value))
+
+
 @register.filter(name='qrcode')
 def qrcode_filter(value, name=None):
     if not qrcode: