templatetags: manage lazy variable on decimal filter (#30793)

tests/test_formdata.py

@@ -1308,3 +1308,31 @@ def test_form_digest_date(pub):
     formdata.data = {'0': time.strptime('2015-05-12', '%Y-%m-%d')}
     formdata.store()
     assert formdef.data_class().get(formdata.id).digest == 'plop  plop'
+
+def test_lazy_formdata_decimal_filter(pub):
+    formdef = FormDef()
+    formdef.name = 'foobar'
+    formdef.url_name = 'foobar'
+    formdef.fields = [
+        fields.StringField(id='0', label='value', varname='value'),
+        fields.StringField(id='1', label='arg', varname='arg')
+    ]
+    formdef.store()
+    formdata = formdef.data_class()()
+    formdata.data = {'0': '3.14', '1': '3'}
+    formdata.store()
+    pub.substitutions.feed(formdata)
+    for mode in (None, 'lazy'):
+        context = pub.substitutions.get_context_variables(mode=mode)
+
+        tmpl = Template('{{ form_var_value|decimal }}')
+        assert tmpl.render(context) == '3.14'
+
+        tmpl = Template('{{ form_var_value|decimal:1 }}')
+        assert tmpl.render(context) == '3.1'
+
+        tmpl = Template('{{ form_var_value|decimal:form_var_arg }}')
+        assert tmpl.render(context) == '3.140'
+
+        tmpl = Template('{{ 4.12|decimal:form_var_arg }}')
+        assert tmpl.render(context) == '4.120'

wcs/qommon/templatetags/qommon.py

@@ -122,10 +122,14 @@ def parse_decimal(value):
 
 @register.filter(is_safe=False)
 def decimal(value, arg=None):
+    if hasattr(value, 'get_value'):
+        value = value.get_value()  # unlazy
     if not isinstance(value, Decimal):
         value = parse_decimal(value)
     if value is None:
         return ''
+    if hasattr(arg, 'get_value'):
+        arg = arg.get_value()  # unlazy
     if arg is None:
         return value
     return defaultfilters.floatformat(value, arg=arg)