Fixed #28442 -- Fixed crash with nested OuterRefs that reference AutoField.

django/db/models/fields/__init__.py

@@ -959,9 +959,10 @@ class AutoField(Field):
         return value
 
     def get_prep_value(self, value):
+        from django.db.models.expressions import OuterRef
         value = super().get_prep_value(value)
-        if value is None:
-            return None
+        if value is None or isinstance(value, OuterRef):
+            return value
         return int(value)
 
     def contribute_to_class(self, cls, name, **kwargs):

tests/expressions/tests.py

@@ -530,6 +530,16 @@ class BasicExpressionsTests(TestCase):
         # This is a contrived example. It exercises the double OuterRef form.
         self.assertCountEqual(outer, [first, second, third])
 
+    def test_nested_subquery_outer_ref_with_autofield(self):
+        first = Time.objects.create(time='09:00')
+        second = Time.objects.create(time='17:00')
+        SimulationRun.objects.create(start=first, end=second, midpoint='12:00')
+        inner = SimulationRun.objects.filter(start=OuterRef(OuterRef('pk'))).values('start')
+        middle = Time.objects.annotate(other=Subquery(inner)).values('other')[:1]
+        outer = Time.objects.annotate(other=Subquery(middle, output_field=models.IntegerField()))
+        # This exercises the double OuterRef form with AutoField as pk.
+        self.assertCountEqual(outer, [first, second])
+
     def test_annotations_within_subquery(self):
         Company.objects.filter(num_employees__lt=50).update(ceo=Employee.objects.get(firstname='Frank'))
         inner = Company.objects.filter(