Wherenode: Handle not with and condition.

Author: WaVEV

django_mongodb/features.py

@@ -353,6 +353,8 @@ class DatabaseFeatures(BaseDatabaseFeatures):
             # "model_fields.test_jsonfield.TestQuerying.test_isnull_key",
             "model_fields.test_jsonfield.TestSaveLoad.test_json_null_different_from_sql_null",
             "model_fields.test_jsonfield.TestQuerying.test_none_key",
+            "model_fields.test_jsonfield.TestQuerying.test_lookup_exclude",
+            "model_fields.test_jsonfield.TestQuerying.test_lookup_exclude_nonexistent_key",
         },
         "Pipeline filtering": {"model_fields.test_jsonfield.TestQuerying.test_icontains"},
     }

django_mongodb/query.py

@@ -156,7 +156,7 @@ def where_node(self, compiler, connection):
 
     if self.negated and mql:
         lhs, rhs = next(iter(mql.items()))
-        mql = {"$nor": rhs} if lhs == "$or" else {lhs: {"$not": rhs}}
+        mql = {"$nor": rhs} if lhs == "$or" else {"$nor": [mql]}
 
     return mql