Fixed #35167 -- Delegated to super() in JSONField.get_db_prep_save().

Avoids reports of bulk_update() sending Cast expressions
to JSONField.get_prep_value().

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

2 files changed, 29 insertions, 1 deletions

diff --git a/tests/model_fields/models.py b/tests/model_fields/models.py
index fdea06b23d..299e927615 100644
--- a/tests/model_fields/models.py
+++ b/tests/model_fields/models.py
@@ -430,6 +430,17 @@ class RelatedJSONModel(models.Model):
         required_db_features = {"supports_json_field"}
 
 
+class CustomSerializationJSONModel(models.Model):
+    class StringifiedJSONField(models.JSONField):
+        def get_prep_value(self, value):
+            return json.dumps(value, cls=self.encoder)
+
+    json_field = StringifiedJSONField()
+
+    class Meta:
+        required_db_features = {"supports_json_field"}
+
+
 class AllFieldsModel(models.Model):
     big_integer = models.BigIntegerField()
     binary = models.BinaryField()
diff --git a/tests/model_fields/test_jsonfield.py b/tests/model_fields/test_jsonfield.py
index 5a9cf9ad7a..267b9a0e66 100644
--- a/tests/model_fields/test_jsonfield.py
+++ b/tests/model_fields/test_jsonfield.py
@@ -40,7 +40,13 @@ from django.db.models.functions import Cast
 from django.test import SimpleTestCase, TestCase, skipIfDBFeature, skipUnlessDBFeature
 from django.test.utils import CaptureQueriesContext
 
-from .models import CustomJSONDecoder, JSONModel, NullableJSONModel, RelatedJSONModel
+from .models import (
+    CustomJSONDecoder,
+    CustomSerializationJSONModel,
+    JSONModel,
+    NullableJSONModel,
+    RelatedJSONModel,
+)
 
 
 @skipUnlessDBFeature("supports_json_field")
@@ -298,6 +304,17 @@ class TestSaveLoad(TestCase):
         obj.refresh_from_db()
         self.assertEqual(obj.value, value)
 
+    def test_bulk_update_custom_get_prep_value(self):
+        objs = CustomSerializationJSONModel.objects.bulk_create(
+            [CustomSerializationJSONModel(pk=1, json_field={"version": "1"})]
+        )
+        objs[0].json_field["version"] = "1-alpha"
+        CustomSerializationJSONModel.objects.bulk_update(objs, ["json_field"])
+        self.assertSequenceEqual(
+            CustomSerializationJSONModel.objects.values("json_field"),
+            [{"json_field": '{"version": "1-alpha"}'}],
+        )
+
 
 @skipUnlessDBFeature("supports_json_field")
 class TestQuerying(TestCase):