Added an additional attribute `unknown_form_fields` to `FormResource`

If the attribute is set to `True`, the validation method will not
raise an `ErrorResponse` with status 400 but silently strip out
unexpected fields on the form and only return the validated data.

1 files changed, 12 insertions, 0 deletions

diff --git a/djangorestframework/tests/validators.py b/djangorestframework/tests/validators.py
index 18c8c313..c316f209 100644
--- a/djangorestframework/tests/validators.py
+++ b/djangorestframework/tests/validators.py
@@ -138,6 +138,14 @@ class TestFormValidation(TestCase):
         content = {'qwerty': 'uiop', 'extra': 'extra'}
         validator._validate(content, None, allowed_extra_fields=('extra',))
 
+    def validation_allows_unknown_fields_if_explicitly_allowed(self, validator):
+        """If we set ``unknown_form_fields`` on the form resource, then don't
+        raise errors on unexpected request data"""
+        content = {'qwerty': 'uiop', 'extra': 'extra'}
+        validator.unknown_form_fields = True
+        self.assertDictEqual({'qwerty': u'uiop'}, validator.validate_request(content, None), "Resource didn't accept unknown fields.")
+        validator.unknown_form_fields = False
+
     def validation_does_not_require_extra_fields_if_explicitly_set(self, validator):
         """If we include an allowed_extra_fields paramater on _validate, then do not fail if we do not have fields with those names."""
         content = {'qwerty': 'uiop'}
@@ -201,6 +209,10 @@ class TestFormValidation(TestCase):
     def test_validation_allows_extra_fields_if_explicitly_set(self):
         validator = self.MockFormResource(self.MockFormView())
         self.validation_allows_extra_fields_if_explicitly_set(validator)
+        
+    def test_validation_allows_unknown_fields_if_explicitly_allowed(self):
+        validator = self.MockFormResource(self.MockFormView())
+        self.validation_allows_unknown_fields_if_explicitly_allowed(validator)
 
     def test_validation_does_not_require_extra_fields_if_explicitly_set(self):
         validator = self.MockFormResource(self.MockFormView())