Fix the api test

Author: upadhyeammit

ros/api/common/utils.py

@@ -9,7 +9,7 @@
     is_valid_uuid,
     system_ids_by_org_id
 )
-
+from ros.extensions import db
 
 LOG = logging.getLogger(__name__)
 prefix = "VALIDATE REQUEST"
@@ -54,9 +54,8 @@ def check_for_user():
     def check_for_system(ident, inventory_id):
         if not is_valid_uuid(inventory_id):
             abort(404, message='Invalid inventory_id, Id should be in form of UUID4')
-
-        system_id = system_ids_by_org_id(ident['org_id']).filter(
-            System.inventory_id == inventory_id).first()
+        system_id = db.session.scalars(system_ids_by_org_id(ident['org_id']).filter(
+            System.inventory_id == inventory_id)).first()
 
         if system_id is None:
             abort(404, message=f"System {inventory_id} doesn't exist.")