fields: allow basic substitutions variables on django validation (#67734)

tests/test_widgets.py

@@ -1159,6 +1159,13 @@ def test_wcsextrastringwidget_django_validation():
     assert widget.has_error()
     assert widget.error == 'Foo Bar Custom Error'
 
+    pub.substitutions.feed(pub)
+    fakefield.validation = {'type': 'django', 'value': 'value|decimal == today.year'}
+    widget = WcsExtraStringWidget('test', value='foo', required=False)
+    widget.field = fakefield
+    mock_form_submission(req, widget, {'test': str(datetime.date.today().year)})
+    assert not widget.has_error()
+
 
 def test_widgetdict_widget():
     widget = WidgetDict('test', value={'a': None, 'b': None, 'c': None})

wcs/qommon/form.py

@@ -1116,7 +1116,9 @@ class ValidationCondition(Condition):
         self.evaluated_value = value
 
     def get_data(self):
-        return {'value': self.evaluated_value}
+        data = get_publisher().get_substitution_variables()
+        data['value'] = self.evaluated_value
+        return data
 
 
 class ValidationWidget(CompositeWidget):