Fixed #17127 -- Made field validators list independent per form instance. Thanks claudep for report and patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17046 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/forms/fields.py

@@ -178,6 +178,7 @@ class Field(object):
         result = copy.copy(self)
         memo[id(self)] = result
         result.widget = copy.deepcopy(self.widget, memo)
+        result.validators = self.validators[:]
         return result
 
 class CharField(Field):

tests/regressiontests/forms/tests/forms.py

@@ -789,6 +789,19 @@ class FormsTestCase(TestCase):
         f = Person()
         self.assertEqual(f['gender'].field.choices, [('f', 'Female'), ('m', 'Male')])
 
+    def test_validators_independence(self):
+        """ Test that we are able to modify a form field validators list without polluting
+            other forms """
+        from django.core.validators import MaxValueValidator
+        class MyForm(Form):
+            myfield = CharField(max_length=25)
+
+        f1 = MyForm()
+        f2 = MyForm()
+
+        f1.fields['myfield'].validators[0] = MaxValueValidator(12)
+        self.assertFalse(f1.fields['myfield'].validators[0] == f2.fields['myfield'].validators[0])
+
     def test_hidden_widget(self):
         # HiddenInput widgets are displayed differently in the as_table(), as_ul())
         # and as_p() output of a Form -- their verbose names are not displayed, and a