make ObjectIdAutoField.to_python() accept integers as strings

.github/workflows/test-python.yml

@@ -93,6 +93,7 @@ jobs:
           migrations
           model_fields
           model_forms
+          model_formsets
           model_inheritance_regress
           mutually_referential
           nested_foreign_keys

django_mongodb/fields/auto.py

@@ -40,11 +40,14 @@ def to_python(self, value):
         try:
             return ObjectId(value)
         except errors.InvalidId:
-            raise exceptions.ValidationError(
-                self.error_messages["invalid"],
-                code="invalid",
-                params={"value": value},
-            ) from None
+            try:
+                return int(value)
+            except ValueError:
+                raise exceptions.ValidationError(
+                    self.error_messages["invalid"],
+                    code="invalid",
+                    params={"value": value},
+                ) from None
 
     @cached_property
     def validators(self):

tests/model_fields_/test_autofield.py

@@ -0,0 +1,9 @@
+from django.test import SimpleTestCase
+
+from django_mongodb.fields import ObjectIdAutoField
+
+
+class MethodTests(SimpleTestCase):
+    def test_to_python(self):
+        f = ObjectIdAutoField()
+        self.assertEqual(f.to_python("1"), 1)