Formulator: support required property in BooleanValidator that is used in CheckBoxField.

product/Formulator/Validator.py

@@ -227,13 +227,28 @@ class PatternValidator(StringValidator):
 PatternValidatorInstance = PatternValidator()
 
 class BooleanValidator(Validator):
+    property_names = Validator.property_names + ['required']
+
+    required = fields.CheckBoxField('required',
+                                title='Required',
+                                description=(
+    "Checked if the field is required; the user has to check."),
+                                default=0)
+
+    message_names = Validator.message_names + ['required_not_found']
+
+    required_not_found = 'This field is mandatory.'
+
     def validate(self, field, key, REQUEST):
       result = REQUEST.get(key, REQUEST.get('default_%s' % key))
       if result is None:
         raise KeyError('Field %r is not present in request object.' % field.id)
       # XXX If the checkbox is hidden, Widget_render_hidden is used instead of
       #     CheckBoxWidget_render, and ':int' suffix is missing.
-      return result and result != '0' and 1 or 0
+      value = result and result != '0' and 1 or 0
+      if not value and field.get_value('required'):
+        self.raise_error('required_not_found', field)
+      return value
 
 
 BooleanValidatorInstance = BooleanValidator()

product/Formulator/tests/testFormValidator.py

@@ -179,6 +179,15 @@ class BooleanValidatorTestCase(ValidatorTestCase):
             TestField('f'),
             'f', {'f': 0})
         self.assertEqual(0, result)
+        result = self.v.validate(
+            TestField('f', required=1),
+            'f', {'f': 1})
+        self.assertEqual(1, result)
+        self.assertValidatorRaises(
+            Validator.ValidationError, 'required_not_found',
+            self.v.validate,
+            TestField('f', required=1),
+            'f', {'f': 0})
 
 class IntegerValidatorTestCase(ValidatorTestCase):
     def setUp(self):