Fix foreign key usage

inventory-app/api.py

@@ -49,7 +49,7 @@ def get_group_cards():
     print(keys)
     flt = {
         "token.uid_hash": {"$exists": True},
-        "inventory.owner.foreign_id": {"$in": keys}
+        "inventory.owner.username": {"$in": keys}
     }
     prj = {
         "inventory.owner": True,