Fixed #21555 -- Made ValidationError pickable.

Thanks trac username zanuxzan for the report and original patch.

1 files changed, 41 insertions, 0 deletions

diff --git a/tests/validation/test_picklable.py b/tests/validation/test_picklable.py
new file mode 100644
index 0000000000..a8d84dba20
--- /dev/null
+++ b/tests/validation/test_picklable.py
@@ -0,0 +1,41 @@
+import pickle
+from unittest import TestCase
+
+from django.core.exceptions import ValidationError
+
+
+class PickableValidationErrorTestCase(TestCase):
+
+    def test_validationerror_is_picklable(self):
+        original = ValidationError('a', code='something')
+        unpickled = pickle.loads(pickle.dumps(original))
+        self.assertIs(unpickled, unpickled.error_list[0])
+        self.assertEqual(original.message, unpickled.message)
+        self.assertEqual(original.code, unpickled.code)
+
+        original = ValidationError('a', code='something')
+        unpickled = pickle.loads(pickle.dumps(ValidationError(original)))
+        self.assertIs(unpickled, unpickled.error_list[0])
+        self.assertEqual(original.message, unpickled.message)
+        self.assertEqual(original.code, unpickled.code)
+
+        original = ValidationError(['a', 'b'])
+        unpickled = pickle.loads(pickle.dumps(original))
+        self.assertEqual(original.error_list[0].message, unpickled.error_list[0].message)
+        self.assertEqual(original.error_list[1].message, unpickled.error_list[1].message)
+
+        original = ValidationError(['a', 'b'])
+        unpickled = pickle.loads(pickle.dumps(ValidationError(original)))
+        self.assertEqual(original.error_list[0].message, unpickled.error_list[0].message)
+        self.assertEqual(original.error_list[1].message, unpickled.error_list[1].message)
+
+        original = ValidationError([ValidationError('a'), ValidationError('b')])
+        unpickled = pickle.loads(pickle.dumps(original))
+        self.assertIs(unpickled.args[0][0], unpickled.error_list[0])
+        self.assertEqual(original.error_list[0].message, unpickled.error_list[0].message)
+        self.assertEqual(original.error_list[1].message, unpickled.error_list[1].message)
+
+        message_dict = {'field1': ['a', 'b'], 'field2': ['c', 'd']}
+        original = ValidationError(message_dict)
+        unpickled = pickle.loads(pickle.dumps(original))
+        self.assertEqual(unpickled.message_dict, message_dict)