Refs #27563 -- Fixed ModelChoiceField.__deepcopy__() so forms don't share a queryset cache.

Thanks Luke Benstead for the report Simon Charettes for the fix.

1 files changed, 9 insertions, 0 deletions

diff --git a/tests/model_forms/tests.py b/tests/model_forms/tests.py
index b92ba1fa4a..bcde7a868c 100644
--- a/tests/model_forms/tests.py
+++ b/tests/model_forms/tests.py
@@ -1631,6 +1631,15 @@ class ModelChoiceFieldTests(TestCase):
         self.assertIsNot(field1, ModelChoiceForm.base_fields['category'])
         self.assertIs(field1.widget.choices.field, field1)
 
+    def test_modelchoicefield_result_cache_not_shared(self):
+        class ModelChoiceForm(forms.Form):
+            category = forms.ModelChoiceField(Category.objects.all())
+
+        form1 = ModelChoiceForm()
+        self.assertCountEqual(form1.fields['category'].queryset, [self.c1, self.c2, self.c3])
+        form2 = ModelChoiceForm()
+        self.assertIsNone(form2.fields['category'].queryset._result_cache)
+
     def test_modelchoicefield_22745(self):
         """
         #22745 -- Make sure that ModelChoiceField with RadioSelect widget