Ticket #17976: 17976-1.diff

django/forms/widgets.py

@@ -487 +487 @@
             pass
         return super(TimeInput, self)._has_changed(self._format_value(initial), data)
 
+
+# Purposely defined at module level so it is picklable (unlike lambdas or methods)
+def boolean_check(v):
+    return not (v is False or v is None or v == '')
+
 class CheckboxInput(Widget):
     def __init__(self, attrs=None, check_test=None):
         super(CheckboxInput, self).__init__(attrs)
         # check_test is a callable that takes a value and returns True
         # if the checkbox should be checked for that value.
         if check_test is None:
-            self.check_test = lambda v: not (v is False or v is None or v == '')
+            self.check_test = boolean_check
         else:
             self.check_test = check_test
 

tests/regressiontests/forms/tests/fields.py

@@ -25 +25 @@
 __init__(). For example, CharField has a max_length option.
 """
 import datetime
+import pickle
 import re
 import os
 import warnings
@@ -698 +699 @@
         self.assertEqual(False, f.clean('false'))
         self.assertEqual(False, f.clean('FaLsE'))
 
+    def test_boolean_picklable(self):
+        self.assertIsInstance(pickle.loads(pickle.dumps(BooleanField())), BooleanField)
+
     # ChoiceField #################################################################
 
     def test_choicefield_1(self):