prohibit int in ObjectIdAutoField

.github/workflows/test-python.yml

@@ -33,7 +33,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           repository: 'mongodb-forks/django'
-          ref: 'mongodb-5.1.x'
+          ref: 'objectid-no-int'
           path: 'django_repo'
           persist-credentials: false
       - name: Install system packages for Django's Python test dependencies

django_mongodb_backend/features.py

@@ -205,6 +205,8 @@ def django_test_expected_failures(self):
             "lookup.tests.LookupTests.test_in_ignore_none_with_unhashable_items",
             "m2m_through_regress.tests.ThroughLoadDataTestCase.test_sequence_creation",
             "many_to_many.tests.ManyToManyTests.test_add_remove_invalid_type",
+            "many_to_one.tests.ManyToOneTests.test_fk_to_smallautofield",
+            "many_to_one.tests.ManyToOneTests.test_fk_to_bigautofield",
             "migrations.test_operations.OperationTests.test_autofield__bigautofield_foreignfield_growth",
             "migrations.test_operations.OperationTests.test_model_with_bigautofield",
             "migrations.test_operations.OperationTests.test_smallfield_autofield_foreignfield_growth",
@@ -213,6 +215,8 @@ def django_test_expected_failures(self):
             "model_fields.test_autofield.BigAutoFieldTests",
             "model_fields.test_autofield.SmallAutoFieldTests",
             "queries.tests.TestInvalidValuesRelation.test_invalid_values",
+            "schema.tests.SchemaTests.test_alter_autofield_pk_to_bigautofield_pk",
+            "schema.tests.SchemaTests.test_alter_autofield_pk_to_smallautofield_pk",
         },
         "Converters aren't run on returning fields from insert.": {
             # Unsure this is needed for this backend. Can implement by request.
@@ -231,6 +235,7 @@ def django_test_expected_failures(self):
             "queries.test_qs_combinators.QuerySetSetOperationTests.test_order_raises_on_non_selected_column",
             "queries.tests.RelatedLookupTypeTests.test_values_queryset_lookup",
             "queries.tests.ValuesSubqueryTests.test_values_in_subquery",
+            "sites_tests.tests.CreateDefaultSiteTests.test_no_site_id",
         },
         "Cannot use QuerySet.delete() when querying across multiple collections on MongoDB.": {
             "admin_changelist.tests.ChangeListTests.test_distinct_for_many_to_many_at_second_level_in_search_fields",

django_mongodb_backend/fields/auto.py

@@ -22,19 +22,11 @@ def deconstruct(self):
         return name, path, args, kwargs
 
     def get_prep_value(self, value):
-        if value is None:
-            return None
-        # Accept int for compatibility with Django's test suite which has many
-        # instances of manually assigned integer IDs, as well as for things
-        # like settings.SITE_ID which has a system check requiring an integer.
-        if isinstance(value, (ObjectId | int)):
+        if value is None or isinstance(value, ObjectId):
             return value
         try:
             return ObjectId(value)
         except errors.InvalidId as e:
-            # A manually assigned integer ID?
-            if isinstance(value, str) and value.isdigit():
-                return int(value)
             raise ValueError(f"Field '{self.name}' expected an ObjectId but got {value!r}.") from e
 
     def get_internal_type(self):
@@ -46,14 +38,11 @@ def to_python(self, value):
         try:
             return ObjectId(value)
         except errors.InvalidId:
-            try:
-                return int(value)
-            except ValueError:
-                raise exceptions.ValidationError(
-                    self.error_messages["invalid"],
-                    code="invalid",
-                    params={"value": value},
-                ) from None
+            raise exceptions.ValidationError(
+                self.error_messages["invalid"],
+                code="invalid",
+                params={"value": value},
+            ) from None
 
     @cached_property
     def validators(self):

tests/indexes_/test_condition.py

@@ -34,7 +34,7 @@ def test_negated_not_supported(self):
             Index(
                 name="test",
                 fields=["headline"],
-                condition=~Q(pk=True),
+                condition=~Q(pk__isnull=True),
             )._get_condition_mql(Article, schema_editor=editor)
 
     def test_xor_not_supported(self):
@@ -43,7 +43,7 @@ def test_xor_not_supported(self):
             Index(
                 name="test",
                 fields=["headline"],
-                condition=Q(pk=True) ^ Q(pk=False),
+                condition=Q(pk__isnull=True) ^ Q(pk__isnull=False),
             )._get_condition_mql(Article, schema_editor=editor)
 
     def test_operations(self):

tests/model_fields_/test_autofield.py

@@ -1,3 +1,4 @@
+from django.core.exceptions import ValidationError
 from django.test import SimpleTestCase
 
 from django_mongodb_backend.fields import ObjectIdAutoField
@@ -17,4 +18,6 @@ def test_get_internal_type(self):
 
     def test_to_python(self):
         f = ObjectIdAutoField()
-        self.assertEqual(f.to_python("1"), 1)
+        msg = "“1” is not a valid Object Id."
+        with self.assertRaisesMessage(ValidationError, msg):
+            f.to_python("1")