chore: recreate loader if old loader is on different loop (#395)

* Recreate loader if old loader is on incorrect loop

* Lint

---------

Co-authored-by: Cadu <[email protected]>

Author: zeptonaut

graphene_sqlalchemy/batching.py

@@ -137,9 +137,7 @@ def _get_loader(relationship_prop):
             RELATIONSHIP_LOADERS_CACHE[relationship_prop] = loader
         return loader
 
-    loader = _get_loader(relationship_prop)
-
     async def resolve(root, info, **args):
-        return await loader.load(root)
+        return await _get_loader(relationship_prop).load(root)
 
     return resolve

graphene_sqlalchemy/tests/models.py

@@ -27,7 +27,6 @@
 from graphene_sqlalchemy.utils import SQL_VERSION_HIGHER_EQUAL_THAN_1_4, SQL_VERSION_HIGHER_EQUAL_THAN_2
 
 # fmt: off
-import sqlalchemy
 if SQL_VERSION_HIGHER_EQUAL_THAN_2:
     from sqlalchemy.sql.sqltypes import HasExpressionLookup # noqa  # isort:skip
 else: