fix model_fields.test_jsonfield.TestSaveLoad.test_bulk_update_custom_get_prep_value

django/django@9525135

Author: timgraham

django_mongodb_backend/expressions.py

@@ -186,6 +186,12 @@ def when(self, compiler, connection):
 
 def value(self, compiler, connection):  # noqa: ARG001
     value = self.value
+    output_field = self._output_field_or_none
+    if output_field is not None:
+        if self.for_save:
+            value = output_field.get_db_prep_save(value, connection=connection)
+        else:
+            value = output_field.get_db_prep_value(value, connection=connection)
     if isinstance(value, int):
         # Wrap numbers in $literal to prevent ambiguity when Value appears in
         # $project.

django_mongodb_backend/features.py

@@ -98,6 +98,8 @@ class DatabaseFeatures(BaseDatabaseFeatures):
         "prefetch_related.tests.NestedPrefetchTests.test_nested_prefetch_is_not_overwritten_by_related_object",
         "prefetch_related.tests.NullableTest.test_prefetch_nullable",
         "prefetch_related.tests.Ticket19607Tests.test_bug",
+        # {'$project': {'name': Decimal128('1')} is broken? (gives None)
+        "expressions.tests.ValueTests.test_output_field_decimalfield",
     }
     # $bitAnd, #bitOr, and $bitXor are new in MongoDB 6.3.
     _django_test_expected_failures_bitwise = {