Refs #32096 -- Fixed ExclusionConstraint crash with JSONField key transforms in expressions.

Regression in 6789ded0a6.

tests/postgres_tests/test_constraints.py

@@ -7,6 +7,7 @@ from django.db import (
 from django.db.models import (
     CheckConstraint, Deferrable, F, Func, Q, UniqueConstraint,
 )
+from django.db.models.fields.json import KeyTextTransform
 from django.db.models.functions import Left
 from django.test import skipUnlessDBFeature
 from django.utils import timezone
@@ -620,6 +621,22 @@ class ExclusionConstraintTests(PostgreSQLTestCase):
             editor.add_constraint(Scene, constraint)
         self.assertIn(constraint_name, self.get_constraints(Scene._meta.db_table))
 
+    def test_expressions_with_key_transform(self):
+        constraint_name = 'exclude_overlapping_reservations_smoking'
+        constraint = ExclusionConstraint(
+            name=constraint_name,
+            expressions=[
+                (F('datespan'), RangeOperators.OVERLAPS),
+                (KeyTextTransform('smoking', 'requirements'), RangeOperators.EQUAL),
+            ],
+        )
+        with connection.schema_editor() as editor:
+            editor.add_constraint(HotelReservation, constraint)
+        self.assertIn(
+            constraint_name,
+            self.get_constraints(HotelReservation._meta.db_table),
+        )
+
     def test_range_adjacent_initially_deferred(self):
         constraint_name = 'ints_adjacent_deferred'
         self.assertNotIn(constraint_name, self.get_constraints(RangesModel._meta.db_table))