Fixed #36405 -- Fixed Aggregate.order_by using OuterRef.

co-authored-by: Simon Charette <charette.s@gmail.com>

django/db/models/aggregates.py

@@ -120,11 +120,6 @@ class Aggregate(Func):
     ):
         # Aggregates are not allowed in UPDATE queries, so ignore for_save
         c = super().resolve_expression(query, allow_joins, reuse, summarize)
-        c.order_by = (
-            c.order_by.resolve_expression(query, allow_joins, reuse, summarize)
-            if c.order_by
-            else None
-        )
         if summarize:
             # Summarized aggregates cannot refer to summarized aggregates.
             for ref in c.get_refs():

docs/releases/5.2.2.txt

@@ -25,3 +25,7 @@ Bugfixes
 
 * Fixed a regression in Django 5.2 that caused a crash when using ``OuterRef``
   in the ``filter`` argument of an ``Aggregate`` expression (:ticket:`36404`).
+
+* Fixed a regression in Django 5.2 that caused a crash when using ``OuterRef``
+  in PostgreSQL aggregate functions ``ArrayAgg``, ``StringAgg``, and
+  ``JSONBAgg`` (:ticket:`36405`).

tests/aggregation/tests.py

@@ -2413,6 +2413,35 @@ class AggregateTestCase(TestCase):
         }
         self.assertEqual(values, expected_values)
 
+    @skipUnlessDBFeature("supports_aggregate_order_by_clause")
+    def test_string_agg_filter_outerref(self):
+        values = (
+            Publisher.objects.annotate(
+                stringagg=Subquery(
+                    Book.objects.annotate(
+                        stringagg=StringAgg(
+                            "name",
+                            delimiter=Value(";"),
+                            order_by=OuterRef("num_awards"),
+                        )
+                    ).values("stringagg")[:1]
+                )
+            )
+            .values("stringagg")
+            .order_by("id")
+        )
+
+        self.assertQuerySetEqual(
+            values,
+            [
+                {
+                    "stringagg": "The Definitive Guide to Django: "
+                    "Web Development Done Right"
+                }
+            ]
+            * 5,
+        )
+
     @skipUnlessDBFeature("supports_json_field", "supports_aggregate_order_by_clause")
     def test_string_agg_jsonfield_order_by(self):
         Employee.objects.bulk_create(

tests/postgres_tests/test_aggregates.py

@@ -364,6 +364,18 @@ class TestGeneralAggregate(PostgreSQLTestCase):
                         [[], [], [], []],
                     )
 
+    def test_array_agg_with_order_by_outer_ref(self):
+        StatTestModel.objects.annotate(
+            atm_ids=Subquery(
+                AggregateTestModel.objects.annotate(
+                    ids=ArrayAgg(
+                        "id",
+                        order_by=[OuterRef("int1")],
+                    )
+                ).values("ids")[:1]
+            )
+        )
+
     def test_bit_and_general(self):
         values = AggregateTestModel.objects.filter(integer_field__in=[0, 1]).aggregate(
             bitand=BitAnd("integer_field")