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

        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

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

        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)