allow MongoAutoField to use int

Author: timgraham

django_mongodb/fields/auto.py

@@ -18,7 +18,10 @@ def __init__(self, *args, **kwargs):
     def get_prep_value(self, value):
         if value is None:
             return None
-        if isinstance(value, ObjectId):
+        # 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)):
             return value
         try:
             return ObjectId(value)