fix: wrong group creation in mutate UserCreation (#1762)

src/ai/backend/manager/models/user.py

@@ -10,6 +10,7 @@
 import sqlalchemy as sa
 from dateutil.parser import parse as dtparse
 from graphene.types.datetime import DateTime as GQLDateTime
+from graphql import Undefined
 from passlib.hash import bcrypt
 from sqlalchemy.dialects import postgresql as pgsql
 from sqlalchemy.engine.result import Result
@@ -574,6 +575,8 @@ async def mutate(
             _status = UserStatus.ACTIVE if props.is_active else UserStatus.INACTIVE
         else:
             _status = UserStatus(props.status)
+        group_ids = [] if props.group_ids is Undefined else props.group_ids
+
         user_data = {
             "username": username,
             "email": email,
@@ -616,11 +619,11 @@ async def _post_func(conn: SAConnection, result: Result) -> Row:
                 user=created_user.uuid,
             )
             await conn.execute(kp_insert_query)
-            model_store_query = sa.select([groups.c.uuid]).where(
+            model_store_query = sa.select([groups.c.id]).where(
                 groups.c.type == ProjectType.MODEL_STORE
             )
-            model_store_gid = (await conn.execute(model_store_query)).first()["uuid"]
-            gids_to_join = props.group_ids + [model_store_gid]
+            model_store_gid = (await conn.execute(model_store_query)).first()["id"]
+            gids_to_join = [*group_ids, model_store_gid]
 
             # Add user to groups if group_ids parameter is provided.
             if gids_to_join: