remove IntegerField validators from MongoAutoField

Author: timgraham

django_mongodb/features.py

@@ -83,8 +83,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
         "model_forms.test_modelchoicefield.ModelChoiceFieldTests.test_clean_model_instance",
         # MongoAutoField.get_prep_value() must accept numeric pks.
         "model_forms.tests.ModelFormBasicTests.test_int_pks",
-        # AutoField (IntegerField) validators crash MongoAutoField.
-        "model_forms.tests.ModelFormBasicTests.test_recleaning_model_form_instance",
     }
     # $bitAnd, #bitOr, and $bitXor are new in MongoDB 6.3.
     _django_test_expected_failures_bitwise = {

django_mongodb/fields/auto.py

@@ -1,6 +1,7 @@
 from bson import ObjectId, errors
 from django.core import exceptions
 from django.db.models.fields import AutoField, Field
+from django.utils.functional import cached_property
 from django.utils.translation import gettext_lazy as _
 
 
@@ -41,3 +42,8 @@ def to_python(self, value):
                 code="invalid",
                 params={"value": value},
             ) from None
+
+    @cached_property
+    def validators(self):
+        # Avoid IntegerField validators inherited from AutoField.
+        return [*self.default_validators, *self._validators]