Fixed #11183 - BaseForm init leaves pointers pointing back to base_fields

Thanks to margieroginski for the report



git-svn-id: http://code.djangoproject.com/svn/django/trunk@12733 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/forms/models.py

@@ -923,6 +923,12 @@ class ModelChoiceField(ChoiceField):
         self.choice_cache = None
         self.to_field_name = to_field_name
 
+    def __deepcopy__(self, memo):
+        result = super(ChoiceField, self).__deepcopy__(memo)
+        # Need to force a new ModelChoiceIterator to be created, bug #11183
+        result.queryset = result.queryset
+        return result
+
     def _get_queryset(self):
         return self._queryset
 

tests/regressiontests/model_forms_regress/tests.py

@@ -2,7 +2,7 @@ from datetime import date
 
 from django import db
 from django import forms
-from django.forms.models import modelform_factory
+from django.forms.models import modelform_factory, ModelChoiceField
 from django.conf import settings
 from django.test import TestCase
 
@@ -203,3 +203,16 @@ class OneToOneFieldTests(TestCase):
         form = AuthorForm({'publication':u'', 'full_name':'John Doe'}, instance=author)
         self.assert_(not form.is_valid())
 
+
+class ModelChoiceForm(forms.Form):
+    person = ModelChoiceField(Person.objects.all())
+
+
+class TestTicket11183(TestCase):
+    def test_11183(self):
+        form1 = ModelChoiceForm()
+        field1 = form1.fields['person']
+        # To allow the widget to change the queryset of field1.widget.choices correctly, 
+        # without affecting other forms, the following must hold:
+        self.assert_(field1 is not ModelChoiceForm.base_fields['person'])
+        self.assert_(field1.widget.choices.field is field1)